I don't have Poser on this computer, but the meshes use some sections of long 4 sided polygons, which is where the issue lies. It doesn't matter whether I set polygon smoothing at 80, or 180, it still does it. Describing it, I have a character where the neck has elongated polygons up the neck, and at the vertice of each polygon is a long blotchy shadow that makes it look like they have gills. Only it does this everywhere. Down the arms, legs, torso. Even areas that aren't excessively enlongated, if they are low poly, it does it.

The issue is related to scale. I have modelled too many low-polygon objects to redo everything. If I have to keep rendering everything at 5% scale I will, but doing that gives grainy shadow effects and it messes with material settings, which I guess brings up another point - Is there a way to scale material zones with the scale of an object? I didn't notice that Poser does this until I started rendering this way, but if you scale down an object, the material settings don't scale with it. A material with a slightly lumpy surface turns into a spiky concrete texture when it scales down to 5%.

 

Maybe I am just being stubborn, but there has to be another work around.