After booting from the Recovery partition, and running Repair Permissions from Disk Utility, the issue below no longer appeared. For a while, now its back. Running Repair Permissions with Mavericks 10.9 produces the following results. Group differs on Library/Printers/InstalledPrinters.plist; should be 80; group is 0. Permissions differ on Library/Printers/InstalledPrinters.plist; should be -rw-rw-rw- ; they are -rw-r--r-- . Repaired Library/Printers/InstalledPrinters.plist What is the meaning of Group should be 80, is 0? Disk Utility says it repairs the file, but it gets the same error every time. Is this something to be concerned about? Should I just try deleting the file and then reinstalling my printer driver (Canon)?