A few random thoughts, offered in the hope they may be helpful: First of all, check that the vertex and facet count is identical between the two meshes - use UVMapper's Statistics to see if there are differences. If the counts are the same: Does UVM 2 have the "vertices > reorder" tool? It doesn't always work. There are two Dork heads out "in the wild" - the business man has a different vertex order to the others, I think it is. I don't know if that's relevant...