This is Snow Leopard (10.6.8),
it is the best OSX for FCP to me. Its running flawless on our editing systems – no problem. I wonder, whether your system causes problems.
Did you run all updates for 10.6.8 ? (I recommend that)
Then repair permissions
then trash FCP Preferences
then restart your computer,
normally this should resolve your problem.
A very good software is digital rebellion, worth every cent,
cheers
Rainer
factstory
Rainer Wirth
phone_0049-177-2156086
Mac pro 8core
Adobe,FCP,Avid
several raid systems