I'm sure this is some easy oversite on my part but can anyone tell me why when I attempt to render a scene using firefly I get nothing but a gray render image?  I'm using poser 7 on windows vista, attempting to render a scene at 2500x2200 pix. at 2500 dpi.  There are 2 characters in the scene but all i get is a gray render image.   I don't know if it matters but I had been using Poser 8, I dropped back to 7 when I get fed up with all the random crashes.