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When I try to open the Security preference pane on my iMac running Mac OS 10.6.6, it says "loading..." and it never opens. I get this in the console:

3/5/11 4:16:56 PM   System Preferences[724] Could not connect the action resetLocationWarningsSheetOk: to target of class AppleSecurity_Pref
3/5/11 4:16:56 PM   System Preferences[724] Could not connect the action resetLocationWarningsSheetCancel: to target of class AppleSecurity_Pref
3/5/11 4:16:56 PM   System Preferences[724] *** -[NSCFDictionary initWithObjects:forKeys:count:]: attempt to insert nil value at objects[0] (key: NSFont)
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Please accept your own answer to prevent the question from being bumped to the front page again. – Daniel Beck Apr 22 '11 at 9:49
up vote 0 down vote accepted

After much googling, I found the answer here. The fix was to remove duplicate fonts using FontBook.

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