Everything works fine with obj file creation, it's just that the obj or stl or 3ds files cannot be imported in Maxwell Studio (The standalone app for Maxwell).
The files created from MoI from the other PC, can be imported to Maxwell at the PC with the problems so, this can't be a Maxwell problem. Also, Maxwell was installed before MoI and I can't remember having this problem with the previous beta.

I guess it will be difficult to find it...
OK, in a few words...

Installation of Moi has been done twice.
All options are the same
No problems with Moi Files.
One MoI installation cannot produce files that can be imported in Maxwell.