well as far as I had known this was a windows 7 specific issue with flash (i thought i read somewhere at least) I've had a similar instance happen, but what would happen is if i had a flash app open in one window or tab and tried to fullscreen it in another flash app it would freeze until i pressed esc to get out of fullscreen. although ive never had it happen in gs or any dx/ogl app so im not sure its the same issue, plus i thought it was only for win7