My Mac recently crashed because of a large PDF that I opened, and I've restarted twice but both times, the 4 fingers up/down multitouch features no longer work, F3/F4 (Expose and Dashboard) don't work, and the Dock is missing. The Dock isn't hidden; I've looked in the preferences. I've searched and read that deleting com.apple.dock.plist in Library/Prefs might work, but I don't have that file. I do have com.apple.dockfixup.plist though. Should I delete that? I don't have access to my OSX disc.