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youtube - no video playback on full screen mode

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when playing a youtube video from the youtube website it won't play at full screen, it only plays back video from the video player window. When I try to go full screen I only get the audio portion and a black screen.

Full screen will play Youtube videos back properly from Internet Explorer or if I play back a video embedded in a website, but not from Mozilla.

This has been going on four or five days now and I was hoping it would correct itself, but to no avail.

Thank you, Annette

when playing a youtube video from the youtube website it won't play at full screen, it only plays back video from the video player window. When I try to go full screen I only get the audio portion and a black screen. Full screen will play Youtube videos back properly from Internet Explorer or if I play back a video embedded in a website, but not from Mozilla. This has been going on four or five days now and I was hoping it would correct itself, but to no avail. Thank you, Annette

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Try to disable the hardware acceleration in the Flash Player. See Flash videos won't play full screen

Flash "Display settings" window: