I haven't encountered that myself. In my scenario I could remove any one of the major objects and the scene would render fine. Which meant there was no problem with any of them individually. But the fact that Poser never even got close to using up RAM meant it had to be something else. I even got rid of all the lights except one, since I had seen other threads that seemed to point to the lights as an issue. I agree with an earlier post that this kind of error shoudl be caught by the program, if there is some limit that isn't obvious to the user, there should be an error message. I worked with CL tech support, and in their defense they were very helpful, but could not solve the problem, and we tended to go in circles somewhat. It never did get resolved. So My only option is to use P4 Renderer for such scenes, which means none of the P5 atmosphere effects could be used in it.