Thanks Michael.
Thats all been a great learning curve for me. I think I have a much clearer understanding of a lot of app file interrelationship problems that have worried me in the past.
Strangely, the Map axis option does have to be checked for MoI .obj files.

The Facet Meshes option is very odd. You then have to convert the items within Carrara if you want to work on them in the Vertex Room!(Which can be slow) I can not see a benefit.

So much I learned. MoI Obj saves is great. Thanks again
Brian