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I have upgraded to Firefox 5 and now when I watch YouTube Video's the sceen turn to green with audio.

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When I watch any YouTube video's now in Firefox 5 the screen turns to green but i can hear audio. I can refresh and do what ever I want but it still stay green. I have the latest in Adobe Flash installed.

When I watch any YouTube video's now in Firefox 5 the screen turns to green but i can hear audio. I can refresh and do what ever I want but it still stay green. I have the latest in Adobe Flash installed.

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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: