Interesting scenario! I am running two computers with the same version of Itunes on both; both are running Windows 7. A laptop that is registered with Itunes as the main source and a desktop that is sharing. If I add a new movie to the Itunes library on both computers. The desktops version will appear on my ATV immediately. The same movie on my laptop will not appear on my ATV. In order for me to get it to show is by disconnecting the ATV and re-connecting! ( adding the 5 digit code ) Annoying because when I disconnect I loose anything that I may have had synced. Like 14000 photos!!!! What gives??