I'm also having problems that started after the new look upgrade for Youtube. Ever since the option to turn on Youtube disappeared from the domain management and I'm getting an error about Youtube not being available for my domain whenever I try to sign in. Now I cannot access my account which I've been using since 2006. It has all my favorites, comments, and so on.
Now, what in the actual fucking shit is this? Youtube was enabled for my domain before, and it worked just fine for a long time. Services lagging a bit behind on coming to Google Apps? I can live with that. Popular services being REMOVED from Google Apps making my accounts unusable? This is just ridiculous. I would laugh if it wasn't so sad. Fix please.