Digital Rebellion has a free app called Preferences Manager. That allows you to trash them, store them, etc. You repair permissions using Disk Utility (in your Applications folder>Utilities). Start Disk Utility, select your drive and click repair permissions. Don’t bother verifying, just repair. Also, if you don’t own Disk Warrior I suggest you get it. It has saved me uncountable times. IMHO every Mac owner should have it. In Mt Lion, go to the Finder>Go menu, hold down Option and the Library folder will appear. Look for com.apple.FinalCut.plist in the Preferences folder.
John
MacPro 8-core 2.8GHz, 16 GB RAM, OS 10.8.4, QT10.1, Kona 3, Dual Cinema 23, ATI Radeon HD 5870, 24″ TV-Logic Monitor, ATTO ExpressSAS R380 RAID Adapter, PDE enclosure with 8-drive 6TB RAID 5
FCS 3 (FCP 7.0.3, Motion 4.0.3, Comp 3.5.3, DVDSP 4.2.2, Color 1.5.3)
FCP-X 10.0.9, Motion 5.0.7, Compressor 4.0.7
Pro Tools HD 10 w SYNC IO & 192 Digital I/O, Yamaha DM1000, Millennia Media HV-3C, Neumann U87, Schoeps Mk41 mics, Genelec DSP Monitors, Prima CDQ120 ISDN