Safari 5.1: Why won't YouTube go fullscreen?

YouTube videos will not display fullscreen in Safari 5.1 (Lion). Why is this? If I try to select the fullscreen option, the video increases in size, but not anywhere close to filling the screen.

HI - I was having this problem myself when I clicked on the expand option in the bottom-right corner of the Youtube player - it just enlarged the video and did not jump to full screen as expected.  Then I tied to double-click on the video, it then jumps into full screen as expected.  Can you try this as it sounds like you are getting the same problem that I was having.

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