Could you all do us a small, tiny, teensy favor? Could you write to us about the issues you're having withe the game? Please make sure you submit your DxDiags or the equivalent if you're on a Mac. This will help us and you in the long run. Thanks :D.
Already done. I got a reply back from Genoan from GOG.com support and he suggested the following:
1) Please make sure that you use "Run as Administrator" to install and to start the game (right click on the shortcut or setup file and select "Run as Administrator").
2) Please add the game to your anti-virus/firewall software's exception/trusted list.
3) Please update your graphics device drivers: http://support.amd.com/us/gpudownload/Pages/index.aspx
4) Please make sure that your graphics card drivers are not forcing any settings upon the game. To do this, right-click an empty area on your desktop and go to:
Catalyst Control Center -> Gaming -> 3D Application Settings
and click “Defaults”.
Unfortunately, none of these steps have resolved the issue.