Hi,
I had the same problem - on some surfaces in one SketchUp model the scaling of texture (in Materials Tray - Edit - setting different size of texture) was working, on some not (it was the same type of surfaces - wall). In SketchUp the size of texture was changing, but in the Vray render not. I don't know why but it helped to reverse the problematic faces and add the material with the texture again. Then it worked.
If someone have the same problem, I hope this will also help him.