Having lots of fun playing around with morphing, I had a go at using 3D modellers, got the exploding part problem. Not bothered, I know that the modeller (FSDS2 of all things, I use it because it's so simple and utterly foolproof in its interface and operation) has wrecked the order of the vertices.

So, had a go with Wings3D (good idea for a modeller, amazingly stupid view controls and a manual to match). Exported a hip part, and eventually, as a test, moved 1 solitary vertex, saved and imported back into Poser. 

Everything worked as advertised until I began to turn the morph dial. While the altered vertex moved smoothly and correctly, every other vertex in the part moved smoothly as well, apparently in the direction of the face normals. 1.00 on the dial produces an enormous beach ball.

If I try import and weld identical vertices, the hip explodes. Anyone know what I should do?