Yes...to answer the original question...mixing materials does cause Vue Pro to crash on my system. So does editing the colors of any function in the atmosphere editor. (light color, sky color, fog color, haze color...etc) I've contacted e-on support and left a couple of threads. My guess is that they've got a problem with the little program that updates their material previews. In any case, this definitely looks like time for a new build...maybe even a 4.51. -SMT

I'd rather stay in my lane than lay in my stain!