Hi Joshua.
I played with this:
And every time I played with it deeper like caustic, etc. Rhino would immediately close in random occasions. Specially when changing the values. And this were happening in the viewport rendering. But when I executed the Render view button, most of the time, Rhino would immediately crash. Strange thing was, if I maximized the viewport and had viewport rendering, the crashes seemed to be less than Rendering the scene.