Oh for the thumbnails, are you running the installer on the same machine where you are trying to view the thumbnails?
Because the thumbnail shell extension gets registered with the installer now, it won't be set up if you run the installer on some other machine and then just copy the files.
You can manually register the shell extension by opening up a command prompt with "Run as Administrator", then cd to the directory where you have MoI and run:
regsvr32 moi_lib.dll
A dialog should pop up "DllRegisterServer in moi_lib.dll succeeded." and then the thumbnail extractor shell extension will be registered with the shell to use for getting thumbnails out of .3dm files.
Thank you, I didn't even have any doubts that I was drawing in a different plane, apparently pushing out at the previous step somehow affected this, so I'll have to keep this in mind all the time.
re:
> Can you put a rounded bevel (0,15 mm) to this model in attachment ?
The maximum it will go is 0.04 units. To go larger the profile curves will need to be cleaned up some more to remove those tiny line segments that Pilou shows above.
I've attached a version that has those removed, it can now be filleted at your target 0.15 radius.