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Running disk utility and reinstalling the O/S are probably not the best first things to do.Except you can run disk utility (/Applications/Utilities) and select your Mac HD and click on repair permissions. That will work while you are logged on and started from your main startup volume. Permissions can get munged and doing this is usually quick, easy and a ...


As @aglasser stated: Open Terminal.app and run: sudo killall VDCAssistant


Looks like this is not possible after all.

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