various places in DS9 have only ambient lighting that affects the characters. i play on a slightly lower graphics setting to increase speed but when i do sometimes characters (including myself) look like shadows. this means in those areas no Ray Tracing for the lighting is set up on the lowest light setting. i had to go back into the advanced tab and put the lighting up a little bit. this i suppose wouldn't be much of an issue if it was intentional, but because it has only happened on certain places in DS9 so far, i am going to assume it's somewhat of a bug.
so far i have experienced this effect in OPS and the shipyard.