I think the attic was originally a 3DS file which has been imported into Poser. I had to fiddle with it to get it set up, but can't remember what I did now (nor what day it is, but that's just old age :-D ). As C1rcle says, go through the materials and make sure all your ambient settings are total black. Shadowcams are most useful for adjusting the size of your shadow map - if you zoom them in so that you can see only the part of the scene which will be in shadow from that light, you can improve the sharpness of your shadows without having to make the shadow map size ridiculously large.