Can no longer play movies via home sharing on Apple TV 2
I'm having trouble sharing movies via iTunes through home sharing. Everything I have is Mac, a 2008 iMac, Airport Extreme, (2) Apple TV 2's, and a Macbook Pro. Everything was fine with this entire setup with all of the movies I've ripped (using the Apple TV 2 settings in Handbrake) until Lion came out. Suddenly I got the 'Content cannot be displayed. Try again later' error message. After much searching, I found that disabling IPv6 was a good solution, temporarily, that is until Apple released iOS 5. I updated the ATV2's, iPhone, and iPad, and iMac with everything that came out during the update, and the issue came back.
I've tried everything I can think of, changing router channels, disabling IPv6 everywhere I saw it, wireless, hardwired, reloading the library, disabling the firewall, countless restarts of all my equipement etc. All of these movies worked perfectly before the updates, and suddenly I cant stream anything through my local MAC network.
Has anyone else seen this? Has anyone found any solutions for this problem? I could really use the help, Apple support is... limited.
AppleTV 2, Mac OS X (10.7.2)