CD youtube html5 problem

It seems that there’s some problem in playing youtube html5 page.

When I clicked “Join the html5 beta” in
Then click a link Inglourious Plummers Trailer - YouTube

I saw it displayed html5 page but it couldn’t start.

Ask if others have the same problem?

Yes. I’m having the same problem. I noticed it a few days ago and already reported the issue to the Dev Team.