Sketchup Materials showing as grey in preview

Hello,

If anyone could please help me out on the following issue it would be much appreciated!

Basically I am copying a model (sofa and chairs) into a new document, however the materials in sketchup are all showing as grey, yet they render correctly. Some have just auto binding, where others are custom binds. Is there an easy way round this issue without having to reapply all the materials?

I’m on the latest version of vray and skp.

thank you!

I would grass that it would help to share a model or screen shots so users can see what is happening and offer help!

image
I can only share a tiny portion of the skp model due to client confidentiality, however this shows the ‘grey’ model. Yet the Vray is this (which renders correctly)

Are these Vray materials, then?

The material in question is one I created on my own using a sketchup tutorial - has mix maps for velvet. The links are there…

Change from Mix (Map) to Auto in Binding.

Binding - Generic Binding and Override Control - V-Ray for SketchUp - Global Site