now if I remember, reflection lite_mult and KD_mult screw up reflections. eg put 2 mirrors facing each other. shine a light and it'll reflect but each time it reflects, it loses energy - the reflection you see as it goes back gets darker. but with those turned on, each reflection gets added to the last - as it goes back in the mirrors, it gets lighter until it's pure white..

thats if I remember right. BB will be along to hit me if I'm wrong ;)