you push your points through an interesting set of programs. As far as
I know, Autocad has a really nasty way of defining polygons (if a poly
is triarangular it simply adds 2 points on the same spot in the poly
definition,im sure that does 'wonders' for normals).
There are a few things that you can always do when you encounter bad geometry in xsi.
Extract polygons and freeze does a good cleaning job most times. If you
have stuff on your poly just run gator on the two and your attributes
will pass thru. Otherwise export and reimport thru dotxsi, obj or
whatever. The trick is that if something gets corrupted, the
export import usually does not understand corrupted parts and hence not
exporting, cleans them. That 4.2 did not suffer but 5.0 did, might be
more serious, and perhaps worth a look; If extracting polys does not
work perhaps you should send support the MTT files.
j