Blackness in Radeon ProRender I'm trying to use Radeon ProRender and it's materials library, however I meet a problem: some parts of objects with default materials (Bronze Brushed and Fabric Matte Solid Beige) look black:

How can I fix these black parts?
I found that I can fix the Fabric material setting lower value to the Reflection Weight than default 1.0:

Result:

However, the same doesn't fix the Bronze material, so additional answer would be very appreciated.