Anyone else ever had a visual problem like this? The lighting and shadows are basically inverted, so where should be shadows there's light and where should be light, there's shadow.

Might also be an issue of Wine, since I'm playing on a Linux system. Tried using Wine 2.22 (since this version was working fine for the most of my games) and 3.9. Installed it via PlayOnLinux and components like dxfullsetup and a 32 bit WinXP wineprefix. The game itself runs really smooth and all, it's just this really annoying shadowing issue (see screenshot on the right, the tree "shadow").

I saw the same behavior when I ran it in Linux. It seems like it could be a graphics driver issue. It would be interesting to see if other hardware/drivers would handle shadows properly.