Since upgrading to Lion, YouTube videos won't play

A couple of weeks ago I decided to update from Snow Leopard to Lion. I thought that would entitle me to free Mountain Lion Updates, since Apple had already announced the launch date, but it seems that isn't the case, which is odd.
In any case, I've been frustrated because ever since the OS update, a lot of YouTube content won't run. Most videos play, but a surprising number show a never-ending circular buffer icon. I have a 20Mbps Internet connection on a Mac Pro with 12Gb of RAM, so this behavior doesn't make sense. Vimeo videos play fine.
I rebooted, zapped the PRAM and tried other fixes without success. I would like to reset the video pref or other configuration files to see if that will help, but I'm not sure which files to delete. Does anyone know what steps I can take?

Hi,
Have you disable the adobe flash accerlator? or how about your wifi setting? is it a WPA? If yes, changed to WEP.
Try
Johnson mok

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