Hello,
I am facing a problem which I can’t solve since december.
When I want to use progressive rendering with gpu acceleration some materials act like mirror/chrome, they loose their structure and colors. While rendering with CPU everything is fine.
Lots of reversed faces. You have some cleaning to do. The standard backface color is the grayish blue, while the front face color is white. Right click on a face, and then click ‘reverse faces’. You can right click on a face which is oriented the right way and click ‘orient faces’, depending on how you have modeled, more or less faces will turn right. Continue till all is white. You might have to apply textures again as well, when done reversing…