Rendered mode: all objects gone black

all objects were white at first

then I set up some materials through layers (wood as an import, metal from internal library). Worked.

But when Rhino crashed, in rendered mode the material of all objects went full black.

I removed all material then, but even adding materials, all objects stayed deeply black:

Saved as another file.

Now all objects are white again, as expected.
Setting up the materials again …

Thank you for the report, I created a YT issue for it.

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This should be working a lot better in the latest RhinoWIP. Please give it a try.