Try to do my setup with no changes (ie selecting only certain materials, creating nodes, and converting it to a Pz2. ) and see if it works ... take it down to the base to see wher ethe process is messing up, then add one step (I am not sure why you are adding image nodes if you want it to be the default, but I am sure there is some reason) and see how that works, add another step and so on .. It could be as simple as there is a some error int he Pz2 conversion (I only do that once in a while so I can't spot it right off).