Spanki.. what I don't understand here is.. shouldn't the artifact have been where the UV Map's seam is then? On Cone # 1 I mean? Or is this the cause of your rotating you mentioned earlier? I can understand if the artifact appears where the seam is, but clearly on your mapped example it does NOT happen at the seam - it's clear from the pic with the distortion caused by the smoothing (interesting btw the way it affects the actual mapping!)

This is fun. I'm not sure what can be done to solve it but I love exploring Poser's quirks, and this is certainly one of them!

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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.