bumbed in to a little problem with the cell window located through World -> Cells...
When I click on the cells located at the far left of the cellwindow my screen goes black, when clicking on the screen chunks return back to normal.
Machine:
Windows 7 Ultimate
Intel® Core i7-2600K CPU @ 3.40GHz
8.00 GB RAM
AMD Radeon HD 6800 Series
4852 MB Total available graphics memory
Thanks in advance!