The problem occurs when you remove some of the mesh - when you do that, some of the vertices are removed also, and the rest of them "close up" to fill the gap. From that point on, you're in trouble. :) Although you then put back an equal number of vertices, they're put at the end of the list, not where the old vertices were taken from. Hence your vertices are out of order. Poser won't complain, because you have the right number; but when you move the dial, the delat which used to refer to her nose (for example) is now part of her ear, and chaos ensues. If you could somehow put the new vertices back exactly where the old ones were taken out, it would work; but I've no idea how to accomplish that. :(