Hi Poebel, right MoI does not handle block instances so you need to run the Explode command in Rhino first before saving out the 3DM file, so that your block instances are converted to regular objects.

After that though their layer assignments in Rhino should come through as style assignments in MoI. If you still have a problem with the styles not working after that, can you please send an example file to me at moi@moi3d.com so I can take a look at it and see what's going on?

- Michael