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- Open System Preferences
- Select Accounts from the View menu
- If it's locked, click on the lock icon in the lower-left and authenticate as requested.
- Select the problematic account from the list on the left.
- Uncheck "Allow user to administer this computer"
- Recheck "Allow user to administer this computer"
- Logout and Login from the Finder to have the changes take effect.
- Proceed to remove to edit the printer list.
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Reference:
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http://support.apple.com/kb/TS2754
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