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Dear Helper, I have problems watching Youtube movies. The page looks ok, but the movie turns black after a second. What could be the problem?

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I work on a Macbook with Mac-OSX, 10.5.8 and have firefox 6.0.1 installed.

I work on a Macbook with Mac-OSX, 10.5.8 and have firefox 6.0.1 installed.

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