http://i.imgur.com/6wibrW5.jpg
Same bug new OS version...
Fastest way to trigger the bug is to grab the scroll bar and take a screen shot with out releasing.
It can also randomly be triggered by scrolling up and down fast ( tested by grabbing the scroll bar and scrolling up and down a few times ) and by taking an unreleated screen shot.
Now perhaps I can be fixed ;^)
morten@usbubuntu:~$ fglrxinfo
display: :0 screen: 0
OpenGL vendor string: Advanced Micro Devices, Inc.
OpenGL renderer string: AMD Radeon HD 6800 Series
OpenGL version string: 4.3.12798 Compatibility Profile Context 13.35.1005