The workaround is here... http://www.youtube.com/html5 and join the HTML Trial.
FireFox, Chrome and Internet Exploder 10 and up. If you're on Exploder 9 - 6 I think YouTube just made your browser obsolete.
I'm looking into this - I could be wrong but that's how it looks on my end.
Anyone else having probs seeing the flash version?
Can you see this vid?