Render problem with infinite light in Poser 2014

reko34

I changed from Poser 6 to Poser 2014 in order to use genesis figures, then I found this render problem. In this picture rendered in Poser 2014, many shadowy edges on the floor can be observed. In Poser 6 the scene looks totally OK.
In my testing, I left only one light and rendered the scene. I found that it is caused by infinite light only, no matter whether the shadow is ON or OFF. The angle of the infinite light affects the angle of the edges.
Is there a way to solve the problem? Or am I setting something wrong?

 

Edit: Pls help me delete this thread. I don't find a delete button. The problematic infinite light is bound with a texture maybe because of my faulty operation. Now everything's fine.