Aha! When Poser 5 came out with raytraced shadows, I pretty much switched to those and never looked back L That'll explain why I haven't seen this problem in the wild.

Or at least sorta... but I guess it wasn't present in Poser 4? Because I really can't recall seeing it and some of my old props are still pretty small.

Also I won't call what you showed here "rendering black" at all. I'd call it "being oddly shadowed" or something but it isn't black. I've seen degenerate facets (at least that's what UVMapper calls them) render completely black and I'm suspecting it's something like this the OP is seeing.

I may of course very well be wrong :)

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You just can't put the words "Poserites" and "happy" in the same sentence - didn't you know that? LaurieA
  Using Poser since 2002. Currently at Version 11.1 - Win 10.