All i can see in the map is one light diagonal from upper left to lower down and some icons - the rest is a big black void :). And it seems like i am on the orbit of the planet... very very high.
I am using nvidia 8800 GTS (the old core) 640MB.
Anyone know how to resolve this ?

I am on your situation (with 8800GT), but it happens only in a few missions. Anyway, for me at least, isnt a big problem.

No. On any map, at any point in the mission the map is the same: a big black screen with only a diagonal lighted. It is "fog of war", but is not represented correctly. Doesn't matter where i am or how much of the map i discovered... (though the icons are moving into the black fog)
For Aitgud: you're right, it isn't a very big problem, but the map is somehow useful in the "RTS" maps (just a little).

In my case, it doesnt happen in the rts missions.

I have the retail version of this game, but I thought it would be worth $6 to have a DRM-free version. I can verify that the map does not work in the GoG version, while it works just fine in the retail version. I've attached two images to show the problem.

I have the exact same problem. It would be really nice if GOG could fix this bug.

Same problem here

I had this problem, but installing GiantHook, which you can find under the stickied Mod thread, fixed it. I'm going to guess that it was a problem with Giants DX7 engine, which GiantHook upgrades to DX8.

I have the same problem. Yet I have an ATI HD 3850. So clearly it's not a driver issue.

Where I get this?

http://www.gog.com/en/forum/giants_citizen_kabuto/mods/_/1
http://www.giantswd.org/?file=31&search_name=hook+&search_author=neo&search_type=&search_db=&sort=Name&Submit=Search

Yep, fixed it for me, thanks

Unfortunately the GiantHook fix didn't work for me. I still have the map problem.