Fullscreen preview option in FCP disappeared???
 

Hi all,
Am running FCP6 and have lost the option to preview fullscreen in the audio video settings menu. It is literally missing, as an option, though the space the option inhabited is still there. Only options I have are to preview via firewire to my CRT monitor. I have tried to refresh AV devices and all frames, but doesn't seems to help/work.

Any suggestions?

Many thanks,

-Tom