Embedded videos from Youtube in firefox are black with sound. In Safari, they view just fine. What is the problem?

I created a Google site at the office and put two videos from youtube in the site. I did this using an earlier version of Firefox and they worked just fine.
Tonight I am using Firefox 9.01 and the two videos are black (no video) but have audio.
They are fine if I open Safari and view.
What could be the problem?

Try to disable the hardware acceleration in the Flash Player.
See:
* https://support.mozilla.org/kb/Cannot+view+full+screen+Flash+videos
* http://www.youtube.com/swf_test.html (right-click the player: Settings)
Flash "Display settings" window:
* http://www.macromedia.com/support/documentation/en/flashplayer/help/help01.html

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Question
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Embedded videos from Youtube in firefox are black with sound. In Safari, they view just fine. What is the problem?

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