Fullscreen video on Google Chrome not playing

Whenever I play a video review (or any video that is posted on this site, for that matter) and try to fullscreen it, it opens in a separate window and goes into fullscreen as it should, but the problem is, the video never starts playing. It also doesn't work in Firefox or Safari. It works fine for YouTube videos and the YouTube Player, but not The Verge videos or The Verge Player.

Is there any fix for this?

Also, I'm on a 2010 MacBook Air running OS X Lion 10.7.2, if that helps.

Thanks. :)