Windows. And nah it’s more like while playing any given video file there will be moments where it looks as if the video is corrupted or something. Strange video artifacts that affect the entire viewport. The issue isn’t actually in the file, as the spots are random upon playback. These were all h.264 mkv files I had trouble with so maybe the issue was with that codec but at the same time that’s the most common codec used for encoding entertainment media for playback. Moving those files over to an iPhone and playing them with infuse worked flawlessly.