Um, I think that's supposed to be a new 'feature'. In other words, music videos are more or less treated like any other music file in ATV now, which means they keep on playing when you exit back to the menu system unless you tell them to stop FIRST with the play/pause button. You might have noticed that ATV shows the mini-video thingy in the corner for them now like a music track does when the screen saver kicks in. I might be OK with these changes except for a couple of irritating behaviors/bugs.
One is that instead of just showing that little corner song name thing, it ALSO shows that time/track bar graph thing filling up as it loads, thus disrupting the whole song-to-song continuous feel of it all and making you remember you're watching ATV, not the music video channel.
The other thing is that when I select Shuffle for music videos, it only seems to work with store-bought videos. Ones I've made myself can only randomly be selected for the very first track. After that, it only shuffles through the ones I bought from the iTunes store and then stops. My other 100+ videos I made with Handbrake from my music DVD collection won't play unless I select them directly, thus defeating the whole point of shuffle play. I have no idea what the issue is, but it seems like Apple doesn't want you making your own content for ATV and iTunes from store-bought products.
It might seem like they want you to buy from the iTunes store, even though it's missing most of the classic music videos out there. I want Venus by Bananarama. It's not available. I can buy Simply Irresistible by Robert Palmer, but Addicted To Love is nowhere to be found. There isn't one single Aerosmith video on iTunes. Paula Abdul only has 3 music videos, apparently. There's a slew of Sheryl Crow videos, but no sign of her first video "All I Wanna Do". Don't even ask for something like the haunted room video for "Got My Mind Set On You" let alone the alternate video for it (penny arcade setting) because they don't have either one. I could go on, but suffice to say 3/4 the videos I looked for are nowhere to be found.
Lag...heck, just give me a front panel reset button (let alone an off switch) for when it inevitably freezes/crashes sooner or later. I guess that's not supposed to ever happen. LOL.
The odd thing there is I started watching Tori Amos' Caught A Lite Sneeze video in iTunes 8.0.1 in Leopard and then moved on to another song while testing CPU usage and when I started the same track in Tiger, it actually resumed where it left off in Leopard (i.e. I do have it share the same library between operating system versions, but I didn't expect that to happen). It must have been a glitch, though since it didn't resume where I left off any other videos I tested. It kind of reminds me of the JVC car stereo I just bought. It'll sometimes remember where it left off playing on my USB stick even if I remove the stick and put it back in a day or two later. Other times, it completely loses its spot if I just turn the car off for 5 minutes and there's not rhyme or reason to its behavior (believe me I've tried to find it).