Jerky playback in full screen & the solution

Hi

System:
Ryzen 1700x OC 3750hz
16GB DDR4
Radeon RX480
Asus B-350 Prime MB
2 drive Raid 0 for caching.
Caching set to DNxHR HQX.

4K clips (Prores) on 1080p 25fps time-line. Dual screen activated (default layout)

Cached playback on main monitor in the small window appears to be fine and fluid, switch to full screen (ctrl +F) playback becomes jerky. Switch to full screen time-line - full screen playback fine. Switch to single screen - full screen playback fine. Switch back to dual screen standard layout - full screen playback jerky. Switch off mixer full screen playback fine.

It appears that any time the mixer is not in view the full screen playback is fine, but any time the mixer is present then the full screen playback becomes jerky.

During full screen playback in any of the above scenarios the committed system resources are monitored as:

CPU: no greater than 10%
HDD: around 30MBps
Memory: 5GB
GPU: 0% (Mostly)

I believe this may be a bug.

Cheers, Paul.

As of Resolve 14.1 this is now resolved!