If you are using displacement in D3D's script, do not keep it at 0.  Input a value, i.e., 0.2 or higher.  With SR3 installation, bump and displacement mapping will cause your render to quick prematurely if it remains at it's default setting.  It took me a better part of a day to narrow down my render problem on a basic scene with plenty of bump and displacement.  A lesson learned.

BTW, Tone mapping is P8's way of introducing gamma correction and controlling specular blowout in your render.  Use HSV Exponential.  Keep in mind, though, as you increase your HSV exponential, your render will subsequently become lighter.  HSV=2 is a good start.