Repairing permissions:
If your computer begins to act strangely, the first thing you should do is repair your permissions. You should also repair your permissions on a regular basis, particularly after software updates or installs, even if nothing seems wrong.
Open Disk Utility (/Applications/Utilities/Disk Utility.app), select your hard-drive, switch to the 'First Aid' tab and press "Repair Disk Permissions."
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