timeslip: If you're using the hardware patch, (or the 2.0 installer, which has the hardware patch included) try this:
Hit Win+r to open the run dialog, Type '%APPDATA%/GOG/DungeonKeeper2/config.ini', (without the ') and underneath the LowZBuffer line, add 'Antialias=0'. (Again, without the ')
That will disable one of the GOG fixes which improves fps on the main menu, but which apparently causes black screen issues for some graphics cards. (Usually those that don't have on board memory.)
Wow thanks for posting this. Downloaded today because of the sale, and the fact that GOG had touted it was fixed. I was not happy when I got the black screen, and the safemode that GOG support page advised trying didn't actually launch anything.
This fix works perfectly, so thank you.
Now time to take over the world!