I recently upgraded to Mountain Lion and have noticed that I can change the settings in preferences for Users and Groups without unlocking.
Should this be the case?
You should be able to change most of the stuff in your own account.
I was able to change Login Items even though the lock symbol is closed and it says "Click the lock to make changes".
Doesn't seem right. Have you tried repairing permissions on the drive?
I tried what you suggested but there is no change.
Retrieving data ...