If you can render to a single image with FireFly then most likely it is the progressive settings. Since you are doing an animation you are going to have to let each frame render out fully. Other then that not sure as I have used the 81 City Blocks model in several movies suing Poser 9/10 and 11.

Poser 5, 6, 7, 8, Poser Pro 9 (2012), 10 (2014), 11, 12, 13