Thanks Michael.
Following an earlier thread, I had reported two file type problems to Carrara (Daz).
I am surprised at the variations of import acceptability into Amapi and Carrara of identical files and, what you say I guess ties in somewhat.
This crazyness is way beyond a joke. Will that universal 3D file type Collada ever be properly organised?
I prefer to save in file types which keeps the various "parts" separated--so much easier for shading. To have to go through that slow creating of "shading domains" with obj files is a real drag.
Should I think of saving all the individual parts as individual obj file? Aaaahhhh!---It looks like it.

Carrara has allways been considered as not accepting obj n-gon files----a real nono!
I just did an exercise with that spray can and Carrara 6.03 accepted the (welllllll----that file!!!) n-gon version with relish?

AAaaaahhhhhh!