I'm using iTunes 10.6.3 64-bit on a 13-inch Mid 2010 MBP running Mountain Lion OSX 10.8.1
When I pause a movie in full-screen mode in iTunes, the resume/play button remains greyed out. The only fix is to exit full screen mode then resume from a regular window, and then switch back to fullscreen.
How can I resume playback when watching fullscreen content?