I often can't open the fullscreen mode in YouTube (OS X Lion) What can I do ?

Since the last 2 weeks I have some problems with YouTube in Safari. I use the newest version of it and OS X Lion.
The problem is ,like mentioned it in the overhead, that I often can't open the fullscreen mode. This also happens with
videos that have 1080p resolution. Where is the problem ? Does others have this problem too ?

YouTube requires the Flash plugin. Try uninstalling the current copy of the plugin then reinstall new. Instructions here >  Troubleshoot Flash Player | Mac OS
If that doesn't help, delete Flash cookies >  Flush.app – Flash Cookie Removal Tool For OS X | MacHacks.TV
And go to your Safari menu bar click Safari > Empty Cache
And from the menu bar again, click Safari > Reset Safari
Select the top 5 boxes then click Reset.

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