Mac OS x AutoCAD viewer shuts down after black screen

Hi,
I just installed AutoCAD WS Mac OS x AutoCAD viewer for viewing dwg and dxf files on my MacBook Pro. The program just shows a black screen then shuts down. What could be the problem? I have the 15" MacBook Pro with the 2.7 GHz Intel Core i7, 16 GB RAM, 512 GB HDD, 1 GB Nvidia GeForce GT 650M Graphics processor and OSx Mountain Lion.
