OSX ML repair permissions says "..usid was modified and not repaired" ?
no sound in YOU tube embeds ; repair permissions says "USID is modified and not repaired" what to do to get sound back?
Permissions repair is useful when Applications will not launch. It does not fix any files that were not installed by Installer.
This approach will not lead you to a solution to your problem.
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If you wish to pursue this message, it is listed among dozens in this article:
Mac OS X: Disk Utility's Repair Disk Permissions messages that you can safely ignore