A printer driver with the wrong switches flipped might not be available to the system or the driver might be unable to access the printer settings file or temporary print queue directories. It made sense that repairing permissions on files for which OS X knew precisely what settings should be in place could fix random faults.
In OS X (and in all Unix and related OSes), a file or directory’s permissions associate which kind of user can perform what kind of action: read, write, execute (run, like a program), and other attributes. The sworn-by advice for years by experienced OS X users and Apple alike was to run Disk Utility and click Repair Permissions as the first step in troubleshooting something gone wrong: a printer driver failing, an app’s strange behavior, a weird interface glitch? Repair permissions! Before digging into how to use the new setup, it’s important to note a key omission: Verify Permissions and Repair Permissions are gone.
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