Seems to be a problem saving the render out as a PNG. If I save it as a JPG, then there are no issues.

Poser Pro 2014 SR 4 btw using network rendering. The errors also don't occur within Poser itself, by that I mean if I render within Poser (instead of over the network) and look at the render in Poser's Render Tab then there are no artifacts. It's just when I export to PNG, and only this setup. I've never had this happen before in any other render.