Has one or more of the panes in System Preferences had its icon change to include a light switch without affecting the pane's functionality? This issue can be resolved by doing the following:
- Quit System Preferences if it is open.
- In the Finder, click on the folder in the Finder's sidebar with the house icon, or for systems running Mac OS X 10.2 or earlier, on the item in the Finder's toolbar with this icon.
- Open the Library folder in the frontmost window, followed by the folder named Caches.
- Throw the item named com.apple.preferencepanes away, and then reopen System Preferences if it was open previously.
