Strange gfx colors
I haven't had that but I have had 1 or 2 problems with those sorts of graphics cards later in the game. Basically grandville, and some other zones didn't work for me until I changed the settings. Cant remember what I done but I'll find out and post it here.
My MA IDs:
Fiend Space: 211464
I used to get tartan buildings (I'm not joking, I have screenshots somewhere).
It tended to be driver problems. I was running a Radeon 9800 with the Catalyst drivers, and every so often after an issue or a patch, I would get tartan buildings until I got the latest Catalyst.
I would also get white Eidolons, which may parallel your white Dark Servants.
I personally haven't seen any tartan buildings since I upgraded to an X800, but I would probably suggest keeping the Catalyst drivers up to date.
I had the latest supported driver for the iMac, but instead I forced an installation of the real latest versions of the drivers (tricky operation). That did the trick.
The colors for special effect (auras, powers, etc) get very strange. Sometimes I see Dark Servants as completely white or pure yellow fire from my Fiery Aura.
I don't have this problem when playing my villains, only my heroes (as far as I could notice anyway).
Have anyone else had similar problems and what did you do to fix them?
Hardware:
iMac 20"
ATI Radeon 2600
Driver Version: 8.43-071016a-056378C-ATI