Currently, I am unable to watch any of the online TV content that is not HULU content. Whenever I try to watch a TV episode (again, other than HULU content) the initial commercial plays, but when the episode is supposed to begin the video goes into an endless buffering mode. I have tried waiting it out (as long as 15 minutes), Flash content plays fine on every other site I have tried, and the TV episodes that are HULU content (ie. Arrested Development, Back in the Game, etc) work fine.
Here are just a couple of the many examples of online content that are not working:
http://xfinitytv.comcast.net/watch/The-Blacklist/4662228359520353112/78760515540/Anslo-Garrick%2C-Part-2/videos
http://xfinitytv.comcast.net/watch/South-Park/9125054853592448112/93205059745/The-Hobbit/videos