Since updating to Flash 11.6 and Firefox 20 videos wont play (Windows XP Pro).
What I have found:
I've tried the recommended suggestions for similar issues listed below without success.
I'm no IT person but I've given you all the information I can think may be useful but hasn't helped me any.
I wound up uninstalling and reinstalling Firefox after trying both your recommendations which were needed (driver was way out of date and 11.7 just released today). Doing a clean install of Firefox 20 seemed to do the trick as it's now working. The issue seems to reside in the Firefox update and not with Flash.
Thanks for your help.