Quoting from CodeCritter:
"
Please post your debug.err file at this thread:
https://forums.galciv2.com/?forumid=421&aid=152947#1213554
Thanks.
Also, in case you haven't tried:
1. Verify that you have the most up-to-date driver for your video card.
2. Try reinstalling the game to make sure no files have been corrupted.
"
So if you describe your problem there and post your debug, CodeCritter can work on it. The more cases, the better I guess so the problem will be weeded out.