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This is a 15" MacBook Pro (Early 2011 model).

In one user account, only a single USB port works. When logging into another user account, both USB ports work. What could be causing this? What would you advise as a fix (short of rebuilding the user account)?

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That's quite the odd problem. Anything odd showing up in your logs? – chrismanderson Oct 24 '11 at 13:55

I have solved the problem. I booted into the Lion recovery mode and repaired the disk permissions. It is now working fine. Hope this can help someone else.

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