Yes, I know one has to play around with it, to get it right for any client presentation. The problem appears to be that it puts the first post on the bottom step and then adds the total rise. Rather than subtracting the height of the first step, or placing the post in front of the first step. I'm not sure what building codes dictate for measurement standards.
The rendering is what bought the program, as this model, a town/row house, had a problem with the original design, during the late afternoon the light coming down the stair well caused a high intensity reflection off the bathroom mirror into the bedroom. But replacing the glass of the bathroom window which opens into the stairwell with a frosted or tinted glass fixed the problem.
Now if they would only place photoboards on location rather than terrain.