Original geschrieben von Gomiaf
Hast Du schon mal von der System-CD gebootet und mit dem Festplattendienstprogramm die Zugriffsrechte repariert?
Rechte reparieren sollte nach Möglichkeit immer vom Startlaufwerk ausgeführt werden (im Gegensatz zur Festplattenüberprüfung per Disk Utility), folgendes dazu findet sich bei macintouch.com (leider kein direktlink möglich):
[Dan Frakes, author of Mac OS X Power Tools] When you run the Repair Disk Permissions routine, it uses the /Library/Receipts folder on the *boot* volume -- the hard drive or CD currently used to start up the computer -- to determine which files are installed and what their permissions should be. When you boot from the CD, the /Library/Receipts folder does not accurately reflect the files on your hard drive, so you don't get the currect "repairs."
For this reason, you should always run Repair Disk Permissions when booted from your normal startup volume. This obviously differs from running Disk Repair, which can only be run from a *different* volume (or by using fsck in single-user mode at startup). One advantage of this is that you can run Repair Disk Permissions at any time, without the need to restart. You can in fact run it from the command line, which means that you can schedule your Mac to repair permissions in the background on a regular schedule, if desired.
As a side note, another thing to mention about the Repair Disk Permissions routine is that it only repairs permissions on system-level files. User-level files are not affected.
Mehr dazu auch in der Knowledge Base:
http://docs.info.apple.com/article.html?artnum=106712