Hi,
After loading the attached FBX file, if I then select the unique mesh "Genesis3Female.Shape" and do:
Replace Mesh -> Export Mesh
then right after that
Replace Mesh -> Replace Mesh
choosing the exact same OBJ file that I just exported, then the result is a completely messed up mesh.

The OBJ file hasn't be touched in anyway so one would expect that nothing happens, replacing the mesh would just reload an identical mesh.

This is a serious bug and a showstopper.