What I'm not clear on is whether the groups have got mixed up in your mesh, or whether the hierarchy is mixed up in the CR2. Do you have some independent way of checking the mesh grouping? I'd use UVMapper Pro, and select by group to see what actually appeared, but there must be many ways of accomplishing that test. The hierarchy can be checked by looking at the CR2 in an editor (text editor, or dedicated Poser file editor). Something else I missed the first time - I'm not sure why you need a MTL file?