Graphic bug in feature manager

hi,

i have a graphic bug in my feature manager.

In a day, i have 10-12 X this problem: i see windows background (wallpaper) in my feature manager. I must move my solidworks for that disappear. (sorry for my english!)

I have solidworks 2012 with SP3 and all my computer is on windows 7 64bit.

I have good drivers for my graphic card ( the drivers on the solidworks site) et all the computer have 16go of RAM.

Do you have an idea ?

SolidworksUser Interface