UI flickering

When moving my mouse about, as it crosses from one area of the UI into another (e.g. from nodes on colour page, to scopes) the UI background flickers.

I have updated my GPU drivers a few times since using the 19 beta (twice while using beta 3). No other software has been running while using Resolve, and this still occurs. This seems to be the only issue I've had, as all renders appear fine after QC checks.

This issue occurs even on a totally new, empty project, and after restarts of Resolve or a PC reboot.

Windows 11, updated but no preview updates.
Currently 22621

RTX 2060, latest drivers (updated a few times, same issue)
Currently 555.99

32GB RAM

DR 19 beta 3 (I did see this once or twice on beta 2). Using PostgreSQL libraries and NAS storage.
All temp / cache go to a dedicated SSD drive on my workstation.
I have updated Windows with one cumulative update since this started, and the Nvidia drivers a few times.

[edit] - As of Version 19 Beta 5 Build 51, this issue persists

[edit] - with Beta 6, Build 59, on Windows 11 build 22621, Nvidia drivers 560.81, issue persists as above.

[edit] - issue persists with the release of 19 out of beta, and with windows build 2261, rlease 220506-1250

[edit] - as of 19.0.2, I still get the UI flicker. It appears more so when I have dual monitors enabled.

[edit] - with 19.0.3 update, UI flicker still present. Windows 11 build 22621, Nvidia 565.90 drivers.

latest drivers

Terms like "latest", "newest", etc. don't really mean much. Especially to readers down the road. You should always be specific about versions.

Point noted, for those down the line. I shall edit and include those

When moving my mouse about, as it crosses from one area of the UI into another (e.g. from nodes on colour page, to scopes) the UI background flickers.

I have updated my GPU drivers a few times since using the 19 beta (twice while using beta 3). No other software has been running while using Resolve, and this still occurs. This seems to be the only issue I've had, as all renders appear fine after QC checks.

This issue occurs even on a totally new, empty project, and after restarts of Resolve or a PC reboot.

Windows 11, updated but no preview updates.
Currently 22621

RTX 2060, latest drivers (updated a few times, same issue)
Currently 555.99

32GB RAM

DR 19 beta 3 (I did see this once or twice on beta 2). Using PostgreSQL libraries and NAS storage.
All temp / cache go to a dedicated SSD drive on my workstation.
I have updated Windows with one cumulative update since this started, and the Nvidia drivers a few times.

Do you have the HDR for viewers option enabled?

I'm experiencing the same issues with the DaVinci_Resolve_19.0b3_Linux. I'm running it on Fedora40 which has known issues with Resolve; It broke with Fedora39 when they stopped using the zlib library which rsolve depends on. Resolve does even want to install on either of these versions but I was able to hack it together using an older outdated package and disabling the incompatible libraries.

I thought the flickering I get was due to the my install on Fedora, but it seems it may be an inherent problem with Resolve since you're getting it in Windows. Good to know.

On 2nd thought, it's more likely a problem with the NVIDIA GPU we're both using. I'm using a GeForce GTX 1070.

I've read more than I ever wanted to about GPU support for Resolve. And it has become apparent to me that Resolve works much better with AMD and Intel. It does not support NVIDIA very well.

I see no flickering with my GTX 1060 in Windows 10.
As far as AMD vs Nvidia there appear to be a lot of problems with AMD drivers. I've used Resolve since version 14 with my GTX 1060 with no problems at all.

I see no flickering with my GTX 1060 in Windows 10.
As far as AMD vs Nvidia there appear to be a lot of problems with AMD drivers. I've used Resolve since version 14 with my GTX 1060 with no problems at all.

This.. I’m not sure where the idea came from that DR is working better with AMD when we see endless issues with AMD drivers… and DR has been fully invested in CUDA since they dropped their own hardware.

I’m not even sure these two issues are related..

Correlation does imply causation.

[Shrinivas Ramani]

Hi all

Please post logs, system info, screenshots, and any information you think pertinent.

And a reminder that this message is still pertinent today.

Regards
Shrinivas

@madchiller: I have only recently enabled that. I did have flickering before. But to be sure, I will test both again this weekend (and any other suggestions for possible causes / solutions). I think I only enabled HDR in viewers after installing Beta 3. This became evident in Beta 2.

@ShrinivasRamani: Will do. As stated above, I will check this post again on the weekend, in order to try any suggestions for causes, and then post as you requested (and any other feedback should the testing have any results).

@madchiller: I have only recently enabled that. I did have flickering before. But to be sure, I will test both again this weekend (and any other suggestions for possible causes / solutions). I think I only enabled HDR in viewers after installing Beta 3. This became evident in Beta 2.

@ShrinivasRamani: Will do. As stated above, I will check this post again on the weekend, in order to try any suggestions for causes, and then post as you requested (and any other feedback should the testing have any results).

copy @andrew.. On my Dual 1080ti x2 test machine i am not seeing any flicker ( aside from an occasional flicker when my mouse will transition from an HDR screen to an SDR screen, this happens with some other apps so I am leaning towards windows color issue) ... it may be worth booting to safe mode and using DDU to completely remove GPU drivers and then reinstall. (download them and install from safe mode) I am on the latest Studio driver here!!! Good luck!!!

TESTING:
I used the "Disunity Documentary Project 1" from the BMD training materials (although present in all other projects). Only change to any project settings were to point temp folders to my temp drive (cache, etc.) Nothing else changed.

Fresh Windows reboot (and server reboot too - NAS etc.) No other applications running.
UI reset in Resolve.

RESULTS:
Tried with "Use Windows display color management and HDR for viewers" both enabled, and disabled.
UI flicker still present.
Tried tests with video clean feed enabled, and disabled. Same results on both.

Current tests show that as I move over a colour node on the Color page, there is flicker. Mouse moving into or out of the viewer on Colour, Fusion (even if it is an empty viewer).
Present even if bypassing all colour / fusion is selected via view or Shift+D
On the cut page, flcker occurs when moving into or out of the timeline, but not able to replicate this by moving into or over the viewer.
Unable to replicate this on the Edit or Fairlight page.

The UI is what flickers, not the viewers.

No flicker every time, but usually if I move the mouse slower, moving quickly across the viewer, and back to any other area of the UI, does not flicker.

I have not seen any issues in any other software.

@madchiller: Great suggestion on DDU, however, I had actually done as such

@ShrinivasRamani: logs and hwinfo attached. Taken when "HDR viewers were disabled" But UI flicker has been present with this on or off, and since Beta 2. Please let me know any further info or tests that may help.

SYS INFO: (no overclocking in place)
GPU = Nvidia RTX 2060 6GB, driver version 555.99 (but UI flicker present going back several driver versions)
CPU = i5-9600K
RAM = 32GB DDR4 (2x 16)
MOBO = Asus Tuf Z370, BIOS 2701
OS = Windows 11 Home Build 22621.ni_release.220506-1250 (UI flicker present several cumulative updates back already)
SSDs = 1TB Nvme (OS and apps), 250GB SSD (temp, cache, swap), 1TB SSD (data), NAS (media / document storage)

TESTING:
I used the "Disunity Documentary Project 1" from the BMD training materials (although present in all other projects). Only change to any project settings were to point temp folders to my temp drive (cache, etc.) Nothing else changed.

Fresh Windows reboot (and server reboot too - NAS etc.) No other applications running.
UI reset in Resolve.

RESULTS:
Tried with "Use Windows display color management and HDR for viewers" both enabled, and disabled.
UI flicker still present.
Tried tests with video clean feed enabled, and disabled. Same results on both.

Current tests show that as I move over a colour node on the Color page, there is flicker. Mouse moving into or out of the viewer on Colour, Fusion (even if it is an empty viewer).
Present even if bypassing all colour / fusion is selected via view or Shift+D
On the cut page, flcker occurs when moving into or out of the timeline, but not able to replicate this by moving into or over the viewer.
Unable to replicate this on the Edit or Fairlight page.

The UI is what flickers, not the viewers.

No flicker every time, but usually if I move the mouse slower, moving quickly across the viewer, and back to any other area of the UI, does not flicker.

I have not seen any issues in any other software.

@madchiller: Great suggestion on DDU, however, I had actually done as such

@ShrinivasRamani: logs and hwinfo attached. Taken when "HDR viewers were disabled" But UI flicker has been present with this on or off, and since Beta 2. Please let me know any further info or tests that may help.

SYS INFO: (no overclocking in place)
GPU = Nvidia RTX 2060 6GB, driver version 555.99 (but UI flicker present going back several driver versions)
CPU = i5-9600K
RAM = 32GB DDR4 (2x 16)
MOBO = Asus Tuf Z370, BIOS 2701
OS = Windows 11 Home Build 22621.ni_release.220506-1250 (UI flicker present several cumulative updates back already)
SSDs = 1TB Nvme (OS and apps), 250GB SSD (temp, cache, swap), 1TB SSD (data), NAS (media / document storage)

Hey I just wanted to chime back in as after using Magic mask today I managed to see some UI flicker… are you running magic mask?

@Madchiller: Thank you for that update. Sadly, no. I get the same symptoms no matter the nodes. Even when it's a new project, media in timeline, but nothing added or adjust on any node.

But hopefully each bit of extra info helps find the possible cause or workaround.

When moving my mouse about, as it crosses from one area of the UI into another (e.g. from nodes on colour page, to scopes) the UI background flickers.

I have updated my GPU drivers a few times since using the 19 beta (twice while using beta 3). No other software has been running while using Resolve, and this still occurs. This seems to be the only issue I've had, as all renders appear fine after QC checks.

This issue occurs even on a totally new, empty project, and after restarts of Resolve or a PC reboot.

Windows 11, updated but no preview updates.
Currently 22621

RTX 2060, latest drivers (updated a few times, same issue)
Currently 555.99

32GB RAM

DR 19 beta 3 (I did see this once or twice on beta 2). Using PostgreSQL libraries and NAS storage.
All temp / cache go to a dedicated SSD drive on my workstation.
I have updated Windows with one cumulative update since this started, and the Nvidia drivers a few times.

Just by curiosity, did you saw some kind small black square patterns, like appearing randomly on the UI?

@Videoneth: nothing like that, no. It's the background of the GUI, but the mouse cursor, and all controls remain as they should be.

UPDATE: this persists with the new Beta 4

Got rid of the flickering UI by DISABLING G-SYNC on my RTX3070.

I noticed it also and then i remembered that i had turned on G-SYNC and after that the flickering begun.

An update. I have just installed Beta 5, and I still get the UI flicker.
This occurs still under the same circumstances as my original post. And trying after a reboot, and then manually closing any processes that are not needed (not that there are many)

This is still with HDR viewers enabled, and when disabled.

@Roches02: thank you for the G-Sync suggestion. I do not have a G-sync capable screen, but checked the setting, just in case.

Update to 19.0.1 build 6 (just downloaded, but oddly, Resolve gave a notice there is an update)

Windows 11 Build 22621, release 220506-1250
Desktop Video 14.2
Nvidia Drivers 560.94

Still the UI flicker as the mouse pointer crosses into or out of the viewer, persisting from version 18, now through to 19, after trying all suggested trouble shooting above, and persisting through the various Resolve, Windows, and driver updates.

Got rid of the flickering UI by DISABLING G-SYNC on my RTX3070.

I noticed it also and then i remembered that i had turned on G-SYNC and after that the flickering begun.

THANK YOU! That was the issue for me - I was about to necromance the thread, but this solved it! (Note, I didn't have to disable it entirely, just enable it only for Full Screen and that did the trick)

I just did a new Windows install with 19.01 on a system that's been running Resolve okay for years. and now I'm seeing the flickering too.

Latest studio drivers, windows 11, RTX 3090.

It looks like it's flashing my desktop every so often, and yes when I'm moving around my mouse. Been playing around with settings to see if I can get around this.

I don't know if it's a 19.01 specific thing, but every version before on my old Windows 11 install worked perfectly fine.

I have g-sync disabled, but I created a specific profile for Resolve in the 3D applications in Geforce Control Panel. See if that helps. I know I had one before on the old system.

First time poster here. I've been experiencing the same issue. Literally only the UI flickers to black as I move between UI elements. It's especially bad in the Fusion tab, but video plays back just fine and renders perfectly. Everything seems to work beyond the UI issue.

Currently using DaVinci Resolve Studio 19.0.1 on Linux. At least in my case, this issue only occurs while using the Wayland compositor. If I switch to X11, everything works normally; no UI flicker at all. Just wanted to throw my hat into the ring in case any fellow Linux users are experiencing this issue and haven't tried switching back to X11 until this is presumably resolved with an NVidia driver and/or Wayland update.

System specs:

Manjaro Linux, kernal 6.10.6
AMD Ryzen7 5800x3D
NVidia RTX 4070 Ti Super, driver 550.107.02, CUDA 12.4
32 GB RAM

Got rid of the flickering UI by DISABLING G-SYNC on my RTX3070.

I noticed it also and then i remembered that i had turned on G-SYNC and after that the flickering begun.

THANK YOU! That was the issue for me - I was about to necromance the thread, but this solved it! (Note, I didn't have to disable it entirely, just enable it only for Full Screen and that did the trick)

I was also trying to troubleshoot this issue to no end until disabling G-SYNC, which fixed the issue.

The entire UI was flickering.

I will have to turn it off to use Resolve without flickering.

CPU - 5800x3D
GPU - 3080 10gb
16gb ram
running everything from nvme drives

@RogerSingh:

I've had the UI flickering since about 18.5. Shall have to go back and check notes and posts. But I've had it all the way through 19 beta, and now up to and including 19.0.1

I do not have a G-sync display, but let me try the Nvidia control panel settings again, if anything changes (I've tried all I can think of with Windows, Nvidia, and Resolve).

@defiled_amygdala:

Sounds just like mine. The worse seems to be as I move out of, or into, the viewer on the colour page. I did most of my testing in single screen mode, but I'm doing some stuff for a client now, and in dual screen, the flickering seems worse (more than one single flicker now). Before it was a single flicker to black on the UI in single screen. In dual screen it seems like 2 or 3 flickers.

Latest update: UI flicker issues persist.

DaVinci Resolve Studio 19.0.2
Windows 11 Build 22621
Nvidia Driver 565.90

Wanted to share my results here as well since I've now succumb to the flickering UI since upgrading to 19.0.2

Disabling G-Sync fixed the issue for me.

Really frustrating as my PC is a work/gaming machine.

DaVinci Resolve Studio 19.0.2
Windows 10 22H2 19045
RTX 3090 Nvidia Driver 565.90

Just checked, as I've seen a few mentioned disabling G-sync.
I do not have a G-sync monitor, so have checked any global or application specific settings in the Nvidia app, and Nvidia control panel.

And Resolve is not even listed there (it once was when there was still GeForce Experience, but the only setting that ever appeared was for hardware debayer). So no added, or different settings in either of those either. In case this helps anyone troubleshoot - so I have the UI flicker with no G-sync capabilities.

As of today, with the 19.0.3 update, I still get UI flicker apparent on the Colour and Fusion pages, and when moving over a viewer area (into our out of that space)

Version 19.1.1.0008 still has the UI flicker, even when there is media offline. This occurs no matter the source clip codec.

+1
windows 11 24h2, DR studio 19.1.1, nvidia rtx 3090, studio 566.36

+1 for me, it is driving me nuts.
Windows 11 24H2 (Build 26100.2605)
Asus ROG Maximus Z690 Hero
Intel Core i9 13900K
64GB DDR5-5200
Geforce RTX 4090
2 x Samsung 980 Pro NVMe 2TB
nVidia 566.36 Game Drivers
DaVinci Resolve Studio 19.1.2

Enabling or disabling G-Sync has no effect on the flickering.

I have solved the issue (for me) and I strongly advice you to try. The "UI flickering" seems to be a video card glitch rather than a davinci resolve problem. So I tried to do the only thing a user can do with a graphic card (other than updating video drivers): updating the vbios of the card.

I've found there was an update for the vbios of my card that fixes an issue with UEFI and the video signal on startup. It might seems not related to the UI flicker problem, but these kind of bioses will fix stuff that is not mentioned in the release notes. So I've tried to update the vbios and ... bingo ... the UI flickering is completely fixed.

Now, I have an RTX 4090 which is pretty new to the market, but try to check with your manufacturer if a vbios update is available for your card, even if it is older. Sometimes they fix problems that are in common with different models.

The fact that this issue is only present with DaVinci Resolve is beyond my comprehension, but it worked and this is the only thing that matters to me.
Hope this helps.

It may show only with DR since this program is hammering the GPU like very few others.

Geez.. same here. It just "happened" out of nowhere, and it's really frustrating. Now I'm trying to figure out what caused it.
- I've get rid of Nvidia App, and install older drivers.
- I've rollback windows update from 11.12.2024 (KB5048652).
- I've back to Resolve 19.1.1

// Windows 10, RTX 3080, Intel i9 9900K

Guys, I believe I've found solution! I've just follow steps (only with nvidia control panel) from this video:

@ 1:52 - he's in Nvidia control panel showing settings. After this UI flickering in Resolve finally stopped.

Few days ago I've upgrade Geforce experience to Nvidia App, and I've made clean installation process, which probably reset all settings in Nvidia control panel. And I think, that after this an flickering appeared in Resolve.

Now I'm on 566.14 drivers, without geforce experience / nvidia app.

Now I'm on 566.14 drivers, without geforce experience / nvidia app.

GeForce Experience ist obsoleted by the nVidia App. The nVidia App is like Experience useful to get optimized settings specific to your specific GPU: with no influence on the settings for Resolve.exe. Add Resolve.exe manually to the Program Settings list: "Program doesn't support optimization", which means "nVidia App doesn't provice optimized settings for the Program".

However, in the Settings nVidia recommends to disable "Game filters and Photo mode", unless you really need it, since this feature is reported to degrade the performance for some Games.

Fun fact about the 566.14 Studio driver: if I select the settings for "Blackmagicdesign - Fusion (fusion.exe)" from the dropdown in the NVIDIA Control Panel, appereantly those aren't selectet. At least the indicator in the dropdown jumps back to the first entry of the dropdown list. If they were selected, or not, ist not distinguishable: both are the same; in either case are all Features set to "Use global setting". The control panel doesn't provide access to any possible settings, though. Additionaly there might be magic numbers or bitfields to be provided as a reason to provide a profile specific to an application. Whole the profiles' settings are accessible using the NVAPI.

I've just follow steps (only with nvidia control panel) from this video:

The settings shown in this video are quite arguable ...

I'd rather recommend: never change global settings persistently. Wherever you want to apply different settings add a customized profile.

Means: If you ever changed the global setting of a feature, assume this setting as the cause for the flickering. Once you've isolated this, add a profile for Resolve.exe and change the respective feature's setting from "Use global setting" to the driver's default setting for this feature.

https://github.com/Orbmu2k/nvidiaProfileInspector doesn't explain all currently supported features, but can serve as a second window to compare profiles plus allows to export/import a profile (including the global settings) as a backup.

Thank you for the advice to disable G Sync, that cleared it up for me. Was driving me crazy.

Great. So glad people are finding workarounds, as I've had this not just on the colour page now, but edit and Fairlight. I'm going to try that ASAP!!

For reference to those who come across this thread:

I have just updated to 19.1.3.007 Studio.
On Windows 11 26100
Nvidia 566.36 GeForce drivers

With the few projects I have now looked at, and tested, with V-sync (I do not have a G-sync screen), the flicker seems to be gone.

Perhaps we can get a default setting in the Nvidia App, when it runs optimisations, to set this to a default of "off" for Resolve?

JUST FOUND A POSSIBLE FIX.

I started to investigate the issue and played with some settings on Nvidia Control Panel, mainly guided by the following comment from @jgharding on another thread:

Eventually I stopped it by going to the Nvidia "Manage 3D Settings", choosing Resolve, and changing "Preferred refresh rate" to "Application controlled". Not sure why this works, but it put an end to the problem.

I realized that the issue could be related to framerate or the refresh rate that the UI is working at versus te one that the monitor is using.

I couldn't find any "preferred refresh rate" option on my Nvidia Control Panel. However, I was able to find two options for framerate: "Background Application Framerate" and "Max Framerate"

It seems that you can control the output framerate for any app you use and also for the ones in the background. I decided to limit both to 60 FPS using the slider and manually entering the number, restarted Resolve, and problem solved.

I saw video on youtube where a guy was complaining about the framerate changing when he just moved the cursor over the UI. That got me thinking and because I have a fixed 60hz monitor, I tried setting the limit to 60 fps. To be honest, I haven't found any draw backs so far. Feel free to let me know if this works for you too.

The "no v-sync" enabled in my Nvidia control panel seems to have helped (I do not have a G-sync screen, so no option to change for this)

So, the flickering has persisted through all the versions of 19, but it seems like it is tied to VRAM usage (and more so after much processing, so namely colour page and some Fusion items). But I have been messing about with all the suggestions seen online for the same issue, and I strongly feel now that VRAM plays a part in this too. I will keep fiddling and trying to pin it down more confidently.

A restart of Resolve (not Windows too), and then disabling a node that used a lot of GPU processing, kept the flickering at bay (this is with the v-sync set specifically to off)

@paolosergioca: going to test your suggestions too, thank you!!

I've also also experienced this. It happens with high GPU usage. I've got 2, 5K and one 4k display. Once I have a few Fusion clips and some color on a 4k sequence it will happen as I bounce around in the fusion page. It happens faster of I'm in 2 Screen mode and use my third for a clean feed.

If you bounce out to other programs that also use the GPU like any 3D program, it can add to your VRAM usage, so when you go back to Resolve, there's not the same amount available as when you left the program.

Hello everyone! Since my last post here I've changed everything except RTX 3080 in my PC. I've also switched to Windows 11. And until the latest Resolve update everything was fine. Unfortunately the problem has returned with 19.1.4.

On my previous computer I eliminated all options in Nvidia control panel except triple buffering set to ON. This was the option that helped me, but it had its drawbacks: I experienced strange delay during playback on the timeline.

From what I can see, @paolosergioca solution is the best. Setting 60fps eliminated the problem without any side effects

JUST FOUND A POSSIBLE FIX.

I started to investigate the issue and played with some settings on Nvidia Control Panel, mainly guided by the following comment from @jgharding on another thread:

Eventually I stopped it by going to the Nvidia "Manage 3D Settings", choosing Resolve, and changing "Preferred refresh rate" to "Application controlled". Not sure why this works, but it put an end to the problem.

I realized that the issue could be related to framerate or the refresh rate that the UI is working at versus te one that the monitor is using.

I couldn't find any "preferred refresh rate" option on my Nvidia Control Panel. However, I was able to find two options for framerate: "Background Application Framerate" and "Max Framerate"

It seems that you can control the output framerate for any app you use and also for the ones in the background. I decided to limit both to 60 FPS using the slider and manually entering the number, restarted Resolve, and problem solved.

I saw video on youtube where a guy was complaining about the framerate changing when he just moved the cursor over the UI. That got me thinking and because I have a fixed 60hz monitor, I tried setting the limit to 60 fps. To be honest, I haven't found any draw backs so far. Feel free to let me know if this works for you too.

Thank you - changing the max framerate helped! was set to 58 - which is kind of weird in my opinion..

UPDATE TO THE FLICKER ISSUE

Some users reported this flickering issue starting when enabling 10-bit on the GPU and Davinci Resolve, these are the settings I used for everything to work as expected:

1. Activate 10 bit and on the Nvidia Control Panel. On Windows 11, this option triggers auto color management. You will notice because the colors on your monitor start to look off.
2. Disable "automatically manage color for applications" on System > Screen > Color Profile.
3. Open Davinci Resolve, and activated "Use 10-bit precision viewers if available" as well as "Use Windows display color management and HDR for viewers"
4. Save and restart Resolve.

Please, let me know if you find this helpful.

I got the same trouble. The UI of all pages blinks when I click on windows and the top menu bar don't let roll the menus anymore.
I found a fix on Windows 10:
Go to the services.msc, look for NVIDIA Display Container LS service and make it "Disabled".
Restart Resolve. Seems OK. Quit Resolve, I go back to the service and make it "Automatic".

The blinking happeneed again but only 1 situation: when I make the UI fullscreen by the top right corner icon. Not when I do it by the top menu: Workspace > Fullscreen Window
But not long tested, Don't know if it's good or bad.


Seems to be a solution when we can't install the Nvidia Control Panel, which is my case.
→ https://answers.microsoft.com/en-us/windows/forum/all/cant-install-nvidia-control-panel-from-microsoft/4521c741-9c1d-4e9b-ad64-4ec6cfaf3969

Just to keep this updated with findings, in case those help anyone.

I've had pretty good luck with disabling v-sync in Nvidia Control Panel. Mostly.
However, when using AI heavy effects, RAW high resolution source files, and been working on things for a while (long sessions) the flicker tends to come back. Restarting Windows and Resolve helps. So I believe there is a VRAM link.

I haven't experienced any issues in 20 beta as yet (with v-sync always set to off)

I have been experiencing the same UI issue for a long time and have even changed video cards from the RTX3080 (10GB) to the 5070Ti (16GB) and the issue persisted. I've tried most of the suggestions here. I've even contacted support but they couldn't figure it out.
Using GPZ, I kept seeing very high VRAM usage and thought that the RTX3080 was running out of VRAM. The PC would sometimes crash when the 10GB limit is hit.
But now that I have the 5070Ti (16GB) the VRAM still goes up to higher even to 12GB. No fusion effects, editing H.264 4K video.
Closing the program and restarting it fixes the issue temporarily. The same project timeline uses 5GB of VRAM at start up but about 30mins in it jumps up to 12GB of VRAM. Could the UI skipping be caused by a VRAM bug?
I hope support is looking into this UI/VRAM issue.

@Studio One_Nine:
I believe it is something to do with VRAM, yes.
I only have a 2060 6GB, but running GPUZ, or Task Manager (Win 11) I do see the flickering issue is connected in a way to higher VRAM usage.

I can mostly mitigate the flickering by disabling V-Sync in the Nvidia Control panel, as suggested by others.

On the 2060, there is no Resizable BAR, but I have changed legacy IRQ to MSI, which does help overall system stability in Resolve and other software (including games).

My assumption here, is that things are being cached in your VRAM, so try a lower limit for Fusion and see if that help you at all? Definitely disable V-sync (G-sync). And perhaps check if you're using MSI instead of legacy IRQ for the card.

This flickering issue has been around for me for several major versions of Resolve.

Tried v-sync off and setting display to 8bit in windows,
UI doesn't flicker anymore, but rendering artifacts still appear sometimes while using RTX scaling.
I was monitoring GPU VRAM usage: I had almost nothing free during the render, but at some point, 7GB where suddenly available and glitches in the render started happening.

For me, these 2 issues were always linked: the moment the UI started glitching, the RTX scaling starts failing, all because high memory usage (and now, memory suddenly becoming available and not going up in usage again).

I already thoroughly tested my system (memtest, vulkan memory test, burn-in tests, furmar, occt, etc) and everithing is working as intended. Only DaVinci Resolve Studio fails. (I even tried a few games, and they work great with ultra settings, even on Studio Drivers).

I don't know what else to do here, won't update to v20 yet because we still have ongoing projects, but seeing this also happens in v20 doesn't sound good at all.