bjw,
I don't understand why the shadows are a problem. Do you not want shadows? If so, then make sure "cast shadows is turned off for all the lights you are using. Send a screen shot. That may help us see what you have. I would be more inclined to think you could not differentiate the slats of the shutters without shadows, and/or hidden line rendering. That's the problem I constantly encounter. RenderWorks shadows are nowhere near as good as the human eye. Object with the same color, and near each other, do not separate well, if they do at all. Yet our eyes see them perfectly fine in the real world.