In iTunes please make sure you have turned on Home Sharing from the 'Advanced' menu and that you are using the same Apple ID to authorize with on all devices.
The screen shot below shows where you turn on Home Sharing.
When viewed from another computer, when Home Sharing is turned on, the icons on the sidebar change. The house icon indicates a Home Sharing library. The stacked CD icon indicates a Library Sharing library. Library Sharing is different and more restrictive than Home Sharing and does not work with iOS devices including the Apple TV.
Currently Being ModeratedOct 29, 2011 5:14 PM (in response to Gino Cerullo)
I have the same problem.
I have two Apple TV 2's, and one original Apple TV.
I have several season passes to TV content, and it plays fine on all of my devices in my Home Share, except for the most recent episodes will not play on my original Apple TV.
In fact Home Share resetting home share is no help at all here for the original Apple TV, because it doesn't specifically use Home Share, rather it has it's own method of syncing similar to how iPods and iPhone's used to sync via USB, only it's over the network.
Long story short, on this same Apple TV (original), I was able to play content as recently as an episode from 10/21, but the latest episode from 10/28 for the same show will not play. I have reset the Apple TV (original) and have re-entered my Apple ID on the Apple TV (original) itself and I still cannot get the content to play.
It is as if Apple has changed their DRM in some way that is now no longer compatible with the original Apple TV. :-(
In my case I was able to fix the authorization issue with my original Apple TV by going into iTunes on the computer to which the Apple TV is attached (over the network), and I went to Store -> Deauthorize, followd by Store -> Authorize.
Then the Apple TV (original) was able to play the latest TV show episode from 10/28, that I had been having trouble playing.
I forgot that from time to time Apple's authorization seems to go "stupid" and things are "half" authorized (some content plays, some content does not), and the workaround is to de/re-authorize iTunes on the computer that's at the heart of how you access your content.
Internet sites are rife with reports of Apple TVs (1,2 and 3) loosing wifi connection. Multiple tips to correct the problem have been posted and most (all?) fail after an interval of hours or days. My plea to posters: please wait a few days before posting your 'successful' tip.