Vegas Pro 19. Video Preview Window goes black during editing playback - sometimes it works on a neighboring clip other times choppy - all seems very random. The Rendering comes out fine, but with the video blacked out in Preview or Trimmer, I have no way to fine tune edits. I doubt it is the system (64 GB RAM, NVIDIA GeForce RTX 3090, i7-11700k 3.6GHz, Windows 11 Pro). I would love to know what settings need to change. Thank you.