Hi Oskar, yes currently MoI does not read block instances from 3DM files, so you do need to explode them in Rhino like you did in order for them to be seen in MoI.

There are also various other kinds of things that Rhino can store in 3DM files as well, like mesh objects, spotlights, annotation dots, etc... - MoI does not work directly with that stuff, it only works with regular NURBS objects from 3DM files.

In the future I want to add instance handling into MoI and then at that time I will probably get something in place to deal with block instances coming from Rhino.

- Michael