| OSX provides Mac users with the old foundation of Unix. One of the benefits of Unix is its multi-user capablity. To manage the users of a system, Unix uses file ownership and permissions.
Think of Repair Disk Permissions as rebuilding the desktop in OS9 since there are tines with OSX that key file ownership and permissions are changed reason by applications, and more frequently, program installers.
When ownership and permissions get changed, things don't always work as they should. Symptoms range from programs quitting unexpectedly, preferences not being remembered, programs not launching, other kernel panics, etc.
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