Huolong, it's not likely to be related to file access (i.e. path references being wrong and poser looking for files) because I can fix my problems by changing shadow map sizes or the number of lights with shadowing enabled. Larry-L, a shadow map is a texture map created by Poser5 during a render that defines the shadowing in a scene. It creates on for every light that has shadowing enabled. Since it's a texture map, it can be different sizes, and each light has a dial that controls the size. The dial controls only one parameter, but the size is square, so a shadowmap size of 256 is a 256X256 texture map. Making it larger takes up more memory. The variables I'm talking are: 1) reduce the number of lights that have shadowing enabled (turn of shadowing on some lights) 2) reduce shadowmap sizes 3) take out some objects in the scene