I just updated my Firefox, and now whenever I use Youtube, I only see black screens where the video should be, but I can still hear the sounds; what gives?

The Youtube pages load as normal, but as stated above, the player contains only a black screen, and the progress bar moves as usual when playing the clip, but I can only hear, and not see, the actual video.
Firefox version: 3.6.14
Windows Vista

Thanks so much for your reply fanboy20. 
Yes, just made sure of that.  I do have the latest version of Flash player.  But I have just staggered upon the answer.  Chalk it up to being a newbi.  I was not putting my apple tv to sleep and it would not allow me to see
you tube on my computer while it was still operating on my TV.  When I realized that, I put the apple tv to sleep and bingo, my computer runs you tube fine.   Thanks again for your response.

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