I'm having dark tree issues even after I convert materials to Vray in the modify menu. I see this short topic about converting the resaving the materials. I don't have any files named '2d.mat' on my system to open via Listener. Can you give a better step-by-step explanation of what to do? Also, the shot of the 'Optimize' panel shows all but one radio button unchecked. By default, all of mine ARE checked. What settings should I use, the default or what I see here?