When playing original Deeper Dungeons, if you'd win a map it becomes darker in color in the maplist, so you can see what maps you have beaten. In KeeperFX this also happens, but not always. Some maps darken when beaten and others wont. I thought this might have something to do with the Score list. If you get on the list after beating the map it darkens if you don't it doesn't.
It's not really an urgent bug/problem, but I noticed it.