Hope that eventually they will get around to fixing this bug. My experience is that it isn't an all-or-nothing; the names vanish about one edit out of three -- perhaps more often if the operation is a delete, less often if it is weld or tesselate or something. I have never had Carrara eat the shader domains, though, so that is a decent work-around. Does mean that after you've gotten everything built you have to run around changing shading domain names to group names (and hope Carrara doesn't act up at that point). Or if you are doing a model for export to some other software (like Poser), you can convert shading domains to groups in a text editor with a simple find-and-replace routine.