Whenever I fullscreen a Flash video in Firefox, 3/4 of screen turns black.

Works in other browsers (Chrome and Opera_. Tried reinstalling both Firefox and Flash. Please help. Here is a picture of the problem: http://i.imgur.com/d9z2gOz.png

You can check for problems with current Flash plugin versions and try these:
*disable protected mode in Flash 11.3 and later
*disable hardware acceleration in the Flash plugin
*http://kb.mozillazine.org/Flash#Troubleshooting

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