Quote Originally Posted by Skyblade View Post
Right click the video and select "Enable Hardware Acceleration". Just toggle it off if it's on, or turn it on if it's off. Then reload the window and see if that helps.
I tried that, and it sort of worked; I could see the video, but it kept pixelating, and going out of synch. Thanks though.

The good news is, I have a new computer now, and I can see YouTube videos now. If I have the problem again, I will try updating Flash like Spuuky suggested.