Hi Magnus - hmm, are you by any chance using blocks inside of Rhino? MoI doesn't really process those right now. Block instances are the only thing I can think of right now that might end up looking like that. I think you can use Explode in Rhino to "unblock" that stuff.

If that doesn't work, can you please post the model file here (or e-mail to me at moi@moi3d.com) and I will check it out.

I'm glad you are liking MoI!

- Michael