Oh yes, sorry for the delay.
I had a 2.5 hour Zoom meeting Tuesday night where the host shared 6 short videos at max resolution and he also shared a few pictures. All of them showed up on my screen without issue and no glitching.
So, for me, I have the following setup in Video Settings, under advanced:
Use Hardware Acceleration - All checked
Video Rendering Method:
Direct3D9
Video Rendering Post Processing:
Auto
Video Capturing Method:
Auto
Thanks for the tips apiwatth - I do hope this helps others!