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Mac OS X Troubleshooting - Repair Disk Permissions
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On your OS X system drive (usually Macintosh HD), go in the Applications>Utilities folder and double-click the Disk Utility. Select your system boot volume on the left (the named drive, usually Macintosh HD), click the First Aid tab on the right, and then click the button on that page that says Repair Disk Permissions. This will take a few minutes, it is a general maintenance routine for the OS, and important to ensure the proper functioning of MIDI and audio.