Thank you for explanation.
I noticed FBX works a lot better in 3dsmax but often I cannot use it because I want to preserve material IDs.
M.

If you have a much older version of 3DS Max, try using the other OBJ importer plug-in from here:
http://guruware.at/main/objio/index.html

Otherwise try using "Quads & Triangles" during your MoI export.

- Michael