Vray doesnt render objects (v 20025244)

[koenvdw]

I made an interior scene and copy pasted quit a few things (groups) from previous scene's.
When I render the scene I see only the floor and walls. No object is visible.

Does this have something to do with groups or materials?

I used "bomb all" to explode every group, but then my scene takes forever in 'preparing vray to render' state.

[koenvdw]

You can ignore this post, I just found a solution.
I copy pasted the whole model in a new Sketchup file.
I guess this removes unused materials.