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How to allow utube videos to play on my Imac

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I can play some utube videos, but not others. Please Help Thanks, Maynard Pettee

I can play some utube videos, but not others. Please Help Thanks, Maynard Pettee

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That is odd. All YouTube videos should play just the same. What is an example of a Youtube video which won't play?

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Chosen Solution

That is odd. All YouTube videos should play just the same. What is an example of a Youtube video which won't play?