Unplug and plug back in. I put movie cover art into iTunes yesterday. Today I check it out on the ATV and ti's missing in some 20 random movies. Just now I take a look and it is still missing. I unplug the ATV and plug it back in. And ATV doesn't see the internet and says I need to find network and re-enter password. BS I say. Entering passwords with that remote is tedious to say the least. So I power cycle again. And bam menus are there. Looking normal. Test to see if movie cover art is there. And it's all there suddenly. I forget the specifics, but had another flakey problem that required a power cycle 2 days ago. Maybe it was album art or changing the photo options or something. Anyway power cycle is your friend and there is a hint of dandruff on the new ATV. Needed an iTunes restart in there too after the 2nd power cycle. That or perhaps a heavy dose of patience would have been the remedy.