Good Wife s.3 ep.6 won't play on Apple TV 1
I downloaded The Good Wife season 3 edpisode 6. It plays fine on the Mac, and on an Apple TV 2. But attempting to play it on an Apple TV 1 results in 'Authorising' with the spinning cursor, followed by 'not authorised on this device'. All my other shows just play; they don't even need to get authorised. I get the same problem whether I stream it from iTunes, or sync it to the Apple TV itself.
Any ideas why ATV1 needs to authorise this show, but not any other show?
Apple TV