I have the same problem with the firefly render engine. I think it's a bug in the program. Have you tried to decreas the quality setting on pixel samples? Try to use draf setting and 3-6 pixel samples. It seems like the more complex the scene is more likely that poser will crash. I usualy render my images at 2500 x 1500 pixels. When using raytrace there is a higher risk that Poser will crash. Be sure to reset all the lights when you apply a new light preset or Poser will crash to. klapakling