Oh! Glad you got it figured out- SubD can make for a heavy render load. I've been selective-only using it on the head for instance. Or in one case the Hair object only.

 

 

OK cured the problem and now I understand why it only happens in Poser 2014.  I tried everything and nothing worked, then I remebered I had the figure skinning method set to Poser unimesh.  Changed that back to Poser traditional and all the 'drop-outs' disappeared.