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kingit: GOG's ddraw.dll provided with game does not work properly hence the grey lines at high areas (they are orange for me, go figure.. :\) Tried replacing it with newer GOG's ddraw, same thing. So I used latest WIP dgVoodoo, working like a conclude, replacing ddraw.dll with DDraw.dll from dgVoodoo is solution for this at the moment, until GOG fixes their ddraw.dll for this game (their current wrapper works fine for most other games, but not for this one...)
Hey! The issue is already reported. We will look into it :) Thank you very much for the additional information.