Meta v76 killed DeoVR.
My Quest 2 updated to v76. When I fired up DeoVR I got a warning that the app is limited due to not be compliant with Meta's guidelines.
Video playback on local or network files now is desaturated/faded, grainy/fuzzy/blurry. 2D videos start at 25-50% screen size and get fuzzier when zooming in.
Streaming video e.g. deovr.com seems unaffected.