Use Mac display color profiles - inverted?

In version 16.2 I had achieved 100% match between look of Rec.709 footage (1-1-1) in Resolve and in QuickTime X, on my iMac (27" late 2013, mac OS 10.15.7) - by simply following the instructions in the manual and on the forum (assuring Rec.709-A input color profile for ProRes 1-1-1 files, and having the 'Use Mac display color profiles for viewers' option activated in Resolve Preferences).

In Resolve v.17 Beta, the same settings produce noticeably darker display, and surprisingly switching the 'Use Mac display color profiles...' OFF produces a much closer look, though not 100% equal to QTX. However, the files produced by the wonderful new 'Generate Proxy Media' functionality, do match the originals perfectly.

So, I'm assuming there is some little bug in the functionality of the 'Use Mac display color profiles...' toggle or in the way Beta displays the image on the computer display? Or am I missing something?

Bump...

It's been a few iterations of the Beta since I posted the above (at this moment I have it at 17.0b6), and the mismatch is still present... - So I'm suspecting that I have something setup in a wrong way.
Could someone please, summarize what settings are necessary to have a ProRes QuickTime 1-1-1 file displayed on a computer screen (iMac) equally to how QuickTime Player displays it?
Thank you!

[Rohit Gupta]

Look into the thread talking about 709-A tagging which is now MacOS interprets 709.

So if you are using RCM, tag 709 source as 709-A and render output as 709-A. Timeline doesn’t matter.

If you are not using RCM set timeline to 709-A when grading 709 files.

Thanks Rohit, but I think I did that,
could you please check if something is missing
- here's my setup:

Resolve Preferences: System:
(on) Use 10-bit precision in viewers if available
(on) Use Mac display color profiles for viewers
(on) Automatically tag Rec.709 Scene clips as Rec.709-A

Project Settings: Color Management:
Color Science: DaVinci YRGB Color Managed
(DR has been restarted after setting!)
Resolve color management preset: Custom
(off) Use separate color space and gamma
Input color space: Rec.709-A
Timeline color space: Rec.709-A
Timeline working luminance: SDR 100
Output color space: Rec.709-A
Limit output gamut to: Output color space
Input DRT: DaVinci
Ouput DRT: DaVinci

The testing files are:
QuickTime ProRes Proxy and HQ files, 1920x1080
Get Info in Finder shows Colour profiles: HD (1-1-1)

The clips in the bin have:
Input Color Space: Rec.709-A
Clip Attribute: Data Levels: Auto

Am I missing some setting somewhere?

Screenshot of the same clip opened in DR Viewer (on the left) and QT (to the right/above) is attached...

DRvsQT

Screenshot 2020-12-21 at 14.50.23.jpg (172.02 KiB) Viewed 1554 times

I am having same problem.,..

Bump.

I've just upgraded to DR Beta 9, and in the meantime did a clean OS reinstall (to macOS 10.15.7, it's a 27" iMac Late 2013 - GeForce GTX 780M), and I think the issue is still here.

I get a perfect match of the HD1-1-1 clip between QT Player and DR Viewer with these settings:
- Preferences: General: Use Mac Display Profiles : Yes(On)
- Project Settings: Color Management: Color Science: DaVinci YRGB
- Clip Attributes: Data Levels: Video

But I'm interested in using the DaVinci YRGB Color Managed workflow,
and with this setting I don't seem to be able to get a perfect visual match - no matter what Input Gamma I set on the clip.

As far as I can remember, in DR version 16 I did have a perfect match in Color Managed workflow for HD1-1-1 clips, if Input Color Space was set to Rec.709, and Gamma to Rec.709-A, (if Mac Display Profiles was set to on), so it would be really nice if it could work that way in version 17 too...