[ubuntu] youtube videos don't display since upgrade to 12.04

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http://ubuntuforums.org – My system is 64-bit Ubuntu 12.04 using a Nvidia GeForce GTX 285M Graphics with 1GB GDDR3 Video Memory. Since upgrading to Ubuntu 12.04, I can no longer see youtube videos in Firefox, Totem or Minitube. I've included screenshots of what I see in Firefox. When I right-click on the Firefox section of where the video should display, I see the following options: Copy, Open with "Movie Player", Fullscreen. When I choose Open with Movie Player, Totem opens and displays an error message which says: An Error occured. Location not found. Ive included a screenshot of the Totem error message (Hardware)