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Lately I've been having trouble watching some Flash movies on my MacBook Pro. Flash does work sometimes - for instance, I can watch any YouTube or Vimeo video. But other sites (Comedy Central, NBC) just give me a black box. If I right-click the box, I get the Flash menu, but nothing ever plays.

This happens in Firefox, Safari and Chrome. Anyone know what to do?

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I have the same problem. Flash was working, and suddenly it now gives black rectangles. Buggy software ! –  Nicolas Barbulesco Oct 6 '13 at 18:15

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up vote 1 down vote accepted

Try (enabling and) logging into the Guest account, and see if the problem happens there. If it doesn't happen there, then it has to do with the Flash settings or preferences or Flash-style cookies or cached files in your main account.

If you don't mind losing your Flash settings, and possibly having to re- log into some Flash-using sites, and possibly losing saved progress on some online Flash games and things like that, you could just delete the folders where Flash stores settings and cookies and caches.

This is one of the big ones:

rm -r ~/Library/Preferences/Macromedia

To find other paths worth investigating, run a command like this:

find ~/Library -iname '*macromedia*' -o -iname '*flash*' -o -iname '*adobe*'

Be judicious with what you choose to delete. Consider moving the current stuff aside, perhaps by dragging it to your Desktop, rather than simply deleting it.

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Thanks! It was something in the preferences folder - removing that resolved my problem. This has removed a massive annoyance from my life - thanks again! –  bill Jul 18 '11 at 3:56
    
This does not solve the problem for me. –  Nicolas Barbulesco Oct 6 '13 at 18:36

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