The only times I've got an error with the z-fletten is when I had selected another bank of props with PBooost, so that the poser ball wasn't available... but I can't remember if it was that error I got at that time. Still if you DO use PBooost, it may be a reason :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.