Hi, yes. I am talking only about the effects of the morphs. FBM/JCM etc. is another topic.
For a morph to be smooth, it must have identical move deltas on the vertices that are involved in a seam? I am speculating that the figures are welded in the UI, and some vertices are not taking part in the surface any more because of the welding. But I have no idea how to make sure :)