Hi Chad,
I could fix it with reinstalling/updating components from Visual C++(2005,2008,2010) and .NET (3.5, 4.0).
It was definitely not enough to install keyshot+plugin (with integrated VisualC++ component).
It was very annoying because it took me several hours to find this solution.
My local reseller, Luxion Support and Keyshot Forum could not help me with this!
JoBa