If I delete all the shadow tmp files I do not get any shadows at all in firefly. I use depth map shadows and infinite lights in this example. These are the default lights when you start Poser. Raytraced shadows work fine - I have no problems with those, but I thought these did not use shadow maps. If only a few people have this problem it is likely that it is system dependant - my guess is with the inability to create shadowmaps for whatever reason.