Screen Tearing & Freezing When playing Back Premiere Pro 15.2
It now appears that when a video is playing and panning left/right (horizontal) there is very notable screen tearing as it redraws in the either the source or program window that's playing. This is a new condition that didn't exist in 15.1 and there is no tearing when playing the same file with Media Player. Preview Renders also display the screen tearing.
If anyone has seen this condition before and has some advice, I would welcome it. I suspect its related to the switch from OpenGL to DirectX - is there a way to revert to OpenGL, release notes imply there is still an OpenGL display render engine available to Premiere.
Tested playback of a 4k H264 30fps, full res, 1/2, 1/4 and 1/8 quality are all affected. If you render preview, the same screen tearing is present.
Interesting to note, Its only present when playing the video clip within premier. Media Player plays back flawless. If you play the video within Premiere and a second window is playing the same file with Media Player, Premiere still tears video and Media Player plays back fine.
The tearing is not observed when there is not fairly aggressive horizontal panning.
A second condition appeared while I was testing, when you double click a file to open it in source window several times in rapid succession, the source window will no longer play or generate errors. The program monitor continues play back with the screen tearing as described above. As you switch between clips for the source monitor there is a greenish (it happens fast) frame flash, before the next video loads. Restoring playback function is possible after several minutes of selecting new videos (or perhaps an auto restart of the redraw code). I am not sure exactly how to trigger the restart of playback when this happens.
I suspect its the new DirectX12 sub-system. I am wondering if there is a way to turn off DirectX and return it back to OpenGL. It may also be possible that this is a driver issue and the next studio version will correct it but I thought this other users could benefit from this observation.
My System for quick reference is Intel 10980XE, 128GB, RTX3090, 5x NVMe Drives.
Studio Driver 462.31 released 04/14/2021
Windows 10 Pro for Workstations version 20H2 Build 19042.964
DirectX 12 version 10.00.19041.0928 64 Bit
+ADDED
Since DirectX 12 is going to be a big part of Premier going forward as it seems to replace the OpenGL engine, I wanted to document the version number here for those who may have this issue and are trouble shooting it. (Run DXDIAG to get this version number)
Thanks in advance.

