I could be late on this, but I think it was today that a new update to FCP was released. Check for software updates to see if you've installed it -- read this and see if you want it... it contains what looks like a load of HVX / P2 improvements.
http://manuals.info.apple.com/en/Final_Cut_Pro_5.0_lbn_z.pdf
http://manuals.info.apple.com/en/Final_Cut_Pro_5.0_lbn_z.pdf