another browser? That is always the first test in these type of problems.
Mark
All of a sudden Youtube thinks I'm using IE7 yet in fact I'm using IE8 with Windows XP. Also I can't get any Youtube videos to play. I've tried uninstalling and re-installing Adobe Flash Player and that didn't fix the problem. I also read that I should check that I don't have compatibility mode turned on and I don't. I'm kind of at a lost. Any suggestions?

Chowhound
Comic Vine
GameFAQs
GameSpot
Giant Bomb
TechRepublic