Hi Mik, both of those files seem to come in ok using the current v3 beta, you can get the current v3 beta here: http://moi3d.com/beta.htm

Most likely it's a bug in the STEP import libraries that MoI uses for reading the STEP file, but one that has been fixed with a newer version of those libraries that is being used by the v3 beta.

Probably the difference has to do with some extended characters (accented characters) in the object names, that seems to be different between the 2 files and I kind of vaguely remember some bug in processing unicode text in a previous version of the import libraries.

- Michael