Construction Library doesn't open due to missing Material

Hi @mingbo

I’ve removed a .json, containing some of the materials, out of the constructions folder before start.
Everything is now working when working in Rhino. Materials are kept within the Model.

But.
When I change for instance conductivity of a previously defined material in my user library it’s not updated anymore with the next reload. Why is that?

And user materials don’t affect Model materials?.

Although in this case it would be wrong because the Model material is the right one (to be precise I adjusted it already, but since it’s not loaded…)

I think this leads here

You may haven’t had the time yet to solve this part also?
So what is best practice regarding which one User or Model should be superior?
Maybe the origin of creation with an option to save it either way?