I'll try to play around with everyone's suggestions this weekend.

That still begs the question though, "Why was this rendering perfectly fine just a month ago?" I might have installed SR 4 within the last month, I'm honestly not sure, but I've been using Poser Pro 2014 for quite a while. The render settings haven't been changed. The lights haven't been changed. Nothing in the scene was altered in the last month, and yet it now doesn't render correctly even though I'm using the exact same settings.