There should be a rgb.cfg in your MBII folder, which I assume the game cannot find. It either isn't there or there's some permission problem due to not running the game as an admin or something. This is my semi-enlightened guess.
In case the file indeed doesn't exist, my semi-experimental fix attempt would be to open up Notepad, paste the following:
red 0
green 0
blue 0
and saving it as rgb.cfg inside GameData/MBII/. The color values of course represent the color, all in 0 meaning black.