There are four files to trash when trying to trash the preferences.
workstation>Mac HD>Users>Workstation>Library>Preferences>com.apple.FinalCutPro.plist
workstation>Mac HD>Users>Workstation>Library>Preferences>Final Cut Pro User Data>Final Cut Pro 6.0 Prefs
workstation>Mac HD>Users>Workstation>Library>Preferences>Final Cut Pro User Data>Final Cut Pro Obj Cache
workstation>Mac HD>Users>Workstation>Library>Preferences>Final Cut Pro User Data>Final Cut Pro Prof Cache
When you delete these files and restart FCP each of these will be rebuilt.
Alan Smith
Media317
Check out my blog – https://media317.com