Ohhh... I have seen this before but HELL if I can remember what caused it... I'll keep wracking my brains...

Do you save your pz3 files of completed scenes? Do you have one that you know rendered okay, that you could open up and render again? If there is a problem with that, then something has gone amiss in your poser settings and a return to factory settings would hopefully take care of that. On the other hand, if it renders okay, then it is probably a setting in your lighting or render settings which is to blame.

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"you are terrifying
and strange and beautiful
something not everyone knows how to love." - Warsan Shire