I know this thread is a few weeks old, but I am having the same issue (or perhaps, a very similar issue) as the original poster here.
I have tried the solutions in the stickied thread. Editing the LUA did not help, and when I searched through my registry, the specified HEIGHT and WIDTH values were not found in the location mentioned - my Gravity Soft folder did not have them.
I have tried setting the resolution via opensetup, and also have tried running the .exe in compatibility mode for other operating systems.
Nothing has worked. Please help if able.
OS: Windows 7
Graphics Card: AMD M880G with ATI Mobility Radeon HD 4250
Screenshot:
http://i43.tinypic.com/2n9gchx.png