Well, I did a test render here with that same set -- PoserWorld's Warehouse Bedroom -- and that same light set, and the reflections work fine for me. You may have checked this already, but the piece of that set you're expecting to reflect V4 is actually some distance below Poser's "ground" level. If your figure and chair are sitting on the "ground," they're actually floating above that surface, and the reflections may be there, but fall out the bottom of the rendered image.