Edit: After half day, my wife’s Mac started having the same problem. I have then applied the solution that I found in the Apple
Customise Your System Preferences in OSX Lion
System Preferences in OSX Lion has a couple of hidden new features inside of it that are screaming to get out:
- To reduce the number of icons shown in the main table of System Preferences,choose View > Customize.The result is that all icons acquire checkboxes, which you can uncheck to specify that a particular icon shouldn’t appear.
- There’s a new way to see the View menu. Instead of going into the menu bar, hold down on the Show All button at the top left of the System Preferences window.
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