lighting problem in Opengl game Combat Mission

I’m new here and stumbled upon this site while looking for information/possible causes of a lighting issue in the game Combat Mission. I am not a programmer and know nothing about what is under the hood of Opengl. The problem is described in the first post of this thread and the developer’s view of it in the fourth. Any feedback about this issue is greatly appreciated.

Well unless you (or more exactly, the developers) can post a minimal source code that reproduces the problem, people on forums will not be able to help in any way.
Providing such a minimal repro case makes it visible for the nvidia people that browse around here too.