Thanks for the reply.

There was a bug in the Furniture Library Editor some time ago

Good, then my memory did not fail me completely.

..change the visible parts of a given model, you should use different MTL

Maybe I do not understand, or we are talking about different things. The d setting in .mtl, it will not help me get what I want. For instance: one model consisting of a door-frame + door, with different named colours in .obj/.mtl. I import one instance of the model and use throughout the home. Where I want the door left 'open', I change that door colour (but not frame) to invisible in the colour dialogue in SH3D. That way the frames remain and I can open and close doors by toggling the colour=invisible.

I will try a couple of options and see what works best. Thanks.

ok