As I've done this sorta thing a zillion times, here are a couple of things to think about: If you mirror a mesh (at least in Max) it makes it "inside-out", that is to say the winding order (which some call normals, but it is really the winding order Poser uses) is now backwards, so in preview mode your actually seeing the bottom of the mesh, not the top. The other thing to remember is when you made (in effect) a new left toe for right side, it is going to be on the same place on the UV map as the original left toe, not where the right one was. Both these problems can be fixed, but you might want to just do the changes by morphs, and avoid 'em.