It could be similar to one of the bugs listed on LaunchPad (#689158), but may not be. Basically, I used to occasionally get a crash on YouTube and opening a new browser or rebooting (don't remember which) took care of the problem. However, now, EVERY time I try to open a video on YouTube, I get the frowning block and the message, "The Adobe Flash plugin has crashed." However, Hulu would also call for Adobe, right? But I can see videos there.
closed as off topic by Marco Ceppi♦ Feb 3 '12 at 0:52
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An alternative would be to use Minitube
Its a Flash Free Youtube Player. It has a nice UI and works well on older systems
Solution can be found at http://www.bwebcentral.com/cms/drupal/node/6560
basically you turn off hardware acceleration in the Adobe Settings.
More info here: hxxp://ubuntuforums.org/showthread.php?t=1699227