Looks like a problem with your graphics card. I had this happen after a crash to desktop or the character screen. A reboot seemed to clear it up. I had "tweaked" the graphics card. I reformated and tweaked again with Omega Drivers and have not had problem in 2 weeks. I think I just had so many bersions of different drivers dangling in the folders that I was having issues.
Try updating video drivers.
If you have NVidia or ATI goto
Omega Drivers