I'd like to say I'm having abit of trouble too, my prop comes out black just like what happened to simontemplar. My raytracing is ticked on too, and everything else is spot on. :( I just don't know what the problem could be, probably something simple i'm missing lol.

Donnie: My parents didn't get me what I wanted for Christmas. Dr. Lilian Thurman: What did you want? Donnie: Hungry Hungry Hippos. Dr. Lilian Thurman: And how did you feel, being denied these hungry, hungry hippos? Donnie: Regret.