It's running fine here on Win 8 64 so I can't see why it wouldn't on Win 7.
Did you try running in Windows XP Compatibility mode?
Also I activated and download my copy from Desura, if that makes any difference.
Thanks for the suggestion, but no luck with Compatibility mode. :/ I'm using a Desura copy as well. Tried re-downloading it in Desura, but that didn't help, either. Still no response from the developers.. damn.