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Helpful answers
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Nov 4, 2013 6:47 PM in response to prhnzby prhnz,A lengthy (and patient - thanks a lot, Jeffrey! - as well as knowledgeable) session with AppleCare solved the problem. Without being able to retrace all the technicalities that led to the solution, the source of the problem appears to have stemmed from the migration from my previous macbook to the new imac (hence not mavericks specific).
I had not done a full migration, but selected only the applications to be transferred. It appears that in the process a whole folder of duplicate application files was created (residing in an unnamed folder inside the Applications folder). There were thus two copies of "System Preferences" which interfered with each other with weird consequences.
(One of the System Preferences opened from the dock, the other from the apple menu.) Sorry that I am unable to give a step by step remedy.
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Dec 17, 2013 6:32 AM in response to prhnzby steven.bohme,I encountered the same problem as prhnz above, but after conducting a search, did not find two copies of the System Preferences application on my computer.
However, I did find that navigating to System Preferences, then turning off Guest User access, and then turning it back on, ... and then closing the lock in the bottom left corner, solved the issue.
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May 22, 2014 6:34 AM in response to steven.bohmeby naz10,thanks, steven.bohme. i had the same problem and your solution worked perfectly.