anyone else having this issue with the most recent movies in the computers section not appearing at all, not even gray boxes for them? And does anyone know of a fix for this to make them reappear?
Not sure exactly how your vids are formatted, but I've found they have to be 'just right' for thumbnails to work, happens that way also with Plex. Many files that play fine don't show thumbnails unless re-encoded to specific Apple requirements.
I am not sure you would need to re-encode the movie. I normally just use Subler to re-write the metadata parts of it. If that does not help, then save as new m4v file, to re-pack the container.
NB! For iTunes to show metadata correctly, the file must have m4v extension, mp4 is not enough. Same story with mov files (they also play ok on aTV, just no metadata display).