In the image (I hope attaches) there are artifacts (if that's the right term). I'm wondering what's causing them, and how to aviod them. I'm using Poser Pro 2010. I have four inverse square point lights and one Inverse linear spot. Using IDL and GC in render settings. What's odd is these artifacts don't always render in the same area it seems.

 

Anyone, any idea's? Anyone seen this before?