Was able to play around with Poser 11 Pro today, and decided to load up the big dystopia file. In Superfly render I am able to get more (infinite) distance. And more distance in Firefly. I didn't do any changes, or adjust. Dunno what happened. I noticed background wall is deleted. Do not see it in my list of stuff in scene. Maybe that is it.

This render is done in SuperFly (very fast). I can also make Dystopia 12x12, and no problems. Notice all the street lights (white) functions. Thanks to "emission" node. :-) Awesome! Just set up one (25.0 evening, 125.0 night) which Dystopia scaled up to 12000%, and they all work.