Unable to see Youtube videos after upgrade to SL

Hi All,
After upgrading my MacBook Pro to SL from a recently installed and very clean (and updated just 2 days ago) Leopard system, I suddenly cannot watch any youtube videos at youtube.com
Where the video should be it is all pitch black.
Right clicking says "Movie not loaded..." followed by "About Adobe Flash Player 10" in the next line.
However I can watch youtube videos embedded at other sites (reddit.com) as well as when I press the top right button (windows mode) at youtube.com.
I do not use anything weird and have not seen any errors in console related to Safari.
I do not get this problem on my iMac which has been upgraded to SL as well without any issues!
Any ideas?
Message was edited by: Vano21

If the issue is limited to your user account try starting up Safe Mode (It will take more time to startup in Safe Mode because it runs a directory check.)
If your apps functions correctly that way, go to System Preferences >> Accounts >> Login Items, and remove them. Boot normally and test. If not go to ~(yourHome)/Library/Contextual Menu Items and move whatever is there to the desktop. Then do the same with /Library/Contextual Menu Items. Lastly, try moving ~(yourHome)/Library/Fonts to your desktop and restarting.
Log out/in or restart, if that sorts it start putting items back one at a time until you find the culprit.
-mj

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