I have encountered a problem with the Materials window/tray since switching to SketchUp Pro 2018.
This bug seems to be related to some specific components/models that I have been copying into new files. The attached image is very basic, but shows the problem. I am able to select materials with the eyedropper, and I am able to create new materials, however any materials that are in the imported components or are created using one of those materials as a basis do not show up in the Materials window/tray and do not show the little white triangle in the corner of the swatch that indicates the materials are being used in the model.
I have been able to replicate this problem by copying (ctrl+c, ctrl+v) these components into a new file and also by importing the components into a fresh model. I am attaching one of the simple components that causes the problem.
I am using SketchUp Pro 2018 on a Windows 10 machine. please let me know if you need any other info or if I need to try to be clearer in my description of the issue.
Component_1.skp (44.2 KB)