I can confirm that all of those bugs are still there and that the best workaround is to use the shader names and export to UVMapper and after you import do not touch it with the vertex modeler again.  Otherwise you get any number of nasty things from crashes to ugly mapping and some weird changes to mapping.  Aside from this really frustrating issue, I really like Carrara and the way it handles many workflow issues.  I just wish they would wrip out the UV Editor portion of the Vertex modeler and create a new UV Modeler totally separate from the Vertex modeler.  It has other issues like when you inadvertantly leave a point that is not connected to the mesh.  Eventually this little lone point corrupts everything resulting in the big crash.  It took me forever to figure out this was what was causing it to crash so often.  Now I am very carefull about deleting things.

I will not be upgrading if the first users report these same problems.  I have Lightwave 9.2 and am migrating my work to that.  It does require a couple of mental gymnastics for me to use it versus Carrara but so did ZBrush.

Dan

Dan