[Eric Rhodes]

Just walked through this with Apple tech support on the phone.

First: quit Final Cut Pro.

Second: Follow this path – User Folder (home)/Library/Preferences – find and TRASH “com.apple.finalcutpro.plist”

Third: Scroll down in that same preferences folder and find the folder “Final Cut Pro User Data” and TRASH it.

Restart FCP and it should fix your problem. Worked for me and it had been giving me trouble for a while.

Hope this helps.