Looks like inverted normals to me. Try selecting the black bits with the Grouping Tool and invert those normals. Then see (start with one of them to verify that this is indeed the cause) what it looks like rendered :o)

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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.