I have been running iOS 5 beta 1 and 2 without a hitch since it release and as you should know, to run iOS 5 beta you need to matching beta iTunes. Now iTunes has never messed up once but just a few minutes ago I was listening to music while updating my old iPod Classic 80GB and iTunes decided to just stop working and shut off. I tried re opening iTunes and I was hit with this message.. Anyone have a clue what to do?! I've never seen this message before with any build of iTunes.