ZModeler UVs not exporting correctly.

I'm trying to take a GTA model and port it to UnrealEngine. When I import the .yft file into ZModeler everything looks perfect, textures are lined up correctly, everything looks correct. I export to .obj, import that into UE4 but some of the parts of the model are skinned correctly and others are not. When I examine the UV's on the problem meshes they are all scrambled. Any ideas?

I'd like to even just be able to export to .obj and import that into 3dsmax but 3dsmax freezes if I try to import an .obj with embedded materials that came from ZModeler.