I have an iMac with latest iTunes, and decided to get an Apple TV a couple of weeks ago. At first I didn't run the update and video seem to playback fine on the TV whilst streaming from the iMac. However now since I have upgraded everything to the latest software, I usually get no more than 5 minutes of playback before I get dropped back at the top level menu for the Apple TV. The computer is still listed in the drop down and I can just re-navigate to my video to resume playback, it is just a pain this is now happening so often. Thanks for your help.