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Unable to import library material into the application


I’m trying to start using Rhinoceros’ render cycles and I’m having some difficulties. I am unable to import materials from the library (provided by rhinoceros) into the application. All .rmtl files appear gray and are not clickable. But when I navigate with finder to the folder, they appear to be normal. If I try to drag from the finder straight to the rhinoceros material panel, the program crashes. I can open the files directly from the finder, but the material opens without the example image.

MacOS Catalina: 10.15.4
Rhinoceros: Version 6