I suddenly can not play videos of any kind

I had not made any changes and suddenly they do not work on any site (MSNBC for example). I have reset Firefox. I have reinstalled Firefox. I have reinstalled Flash.
Videos work on IE (yuck).
Videos work on another computer on my home network using Firefox.

This may be caused by a recent Flash 11.3 update.
See:
*https://support.mozilla.org/kb/keep-flash-up-to-date-and-troubleshoot-problems
*https://support.mozilla.org/kb/flash-crashes-or-does-not-load-firefox-13
*http://forums.adobe.com/thread/1018071?tstart=0
*http://blogs.adobe.com/asset/2012/06/inside-flash-player-protected-mode-for-firefox.html

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