Macbook Pro graphic display problem

[cbolin]

At some point in System Preferences I started seeing this weird anomaly(attached image)

I have no idea what could have happened or how to correct.

Please advise?

 

[eric2006]

Here's a nice, graphical guide that will help you get rid of that:
http://www.silvermac.com/2006/strange-icon-in-system-preferences/

 

[cbolin]

Thanks so much! Worked and it was easy too!