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YouTube videos

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All YouTube videos I'm trying to watch appear as black rectangles and then go blank. This is happening one day after upgrading to the latest Firefox version. I can still listen to the sound though, and see the rest of the page.

I would like to know if there is anything I can do. Many thanks for your help

All YouTube videos I'm trying to watch appear as black rectangles and then go blank. This is happening one day after upgrading to the latest Firefox version. I can still listen to the sound though, and see the rest of the page. I would like to know if there is anything I can do. Many thanks for your help

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Try to disable the hardware acceleration in the Flash Player.

See:

Flash "Display settings" window: