youtube...and other video sites..Follow

Yea I dunno what happened. Last night I was watching youtubing some music, and watching videos from another site.

Then all the videos on both sites started showing just a Green screen. I can get sound, but see nothing but green :o

Anyone have a clue as to why?
I use addblock and noscript (fire fox :D), but had them set up to allow youtube and the other site I was at (break I think, i don't remember..was watching people hurt themselves).