Well, I only have experience in Poser 6, but in my learning experience (not too recently) was loading some lights and thinking, "this stuff suck bad, why did I buy it?".  Well, looking at each light settings, I noticed some have raytraced shadows, which in my opinion should be casting shadows, but it wasn't.  So I looked at settings and realized maybe if I set raytraced on, then it'll look better.  Clicked it on, waited the render out (it got very slow) and it looked a heck of a lot better (and thus I finally got to finish my "Poser" promos on my character coming soon).

In Daz Studio, if you use raytraced shadows, you get more crispy clear images, rather then "smeared charcol" looks that deep shadow map gives.

Long story short, do you have your settings high?

...wolfie