Ah duh! As I hadn't used the hardware shading myself (until now) I'd missed that little thing.

 

so the preview shadows use a shadow map? Live and learn :D

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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.