Import from Rhino to Sketchup, Problem assigning Sketchup and Maxwell Materials

I export my 3D model from Rhino as a .3ds and successfully imported the separate layers individually to Sketchup. When I try to assign Sketchup or Maxwell materials with the paint bucket they often only cover some faces of the layer/object, and those that they do cover do not render.

Material apply and render correctly on test objets I made in Sketchup. Any ideas or help on how to fix this so I can render? Also how to I import the model directly and fully into Maxwell for render, maybe I can assign materials in the suite.

Thanks so much!

I have the same problem.:confused: