If you have "cloth self collision" on, that might also be more than Poser's little brain can comprehend ;)

Also if the converted cloth is VERY polygon heavy - even in places - that can make Poser choke on it.

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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.