Here's a few tips: 1) Turn off that ground shadow thing in the display menu. It asserts if you have too complex a model. 2) Every once in a while, if I have a troublesome figure, I open the cr2 in a text editor and make sure all the storageOffset lines have 0 0 0 as parameters. Sometimes Poser sticks 0 0.3478 0 or some such nonsense and this can cause crashes. Also the last line of the cr2 which is also an offset line should be 0 0 0 3) Clean out the root directory of poser of any irrelevant files. 4) erase the 0bj rsr files now and then, especially the nude woman and nude man models. They get reconstructed by poser but sometimes get corrupted. 5) make sure any models you import do not have funky texture coords. This maybe hard to do if you don't have a 3d tool. If Poser tells you a prop has bad texture coords then don't use it. 6) I usually don't need 3 lights with 3 shadows, just 3 lights with 1 shadow. Poser has to render the scene once for each light that has a shadow. The camera is placed at the light and the scene is rendered to create what's called a stencil buffer. The size of that buffer is determined by the buffer setting for the light. Again this can reduce crashes if the scene only has one light with shadows. 7) I have a backup of the Poser.rsr file. when my system goes bonkers I restore the backup. This tends to clean a few things up. 8) Layers, layers, layers. 9) Watch for circular conform links for clothes ie shirt conforms to figure who conforms to pants who conforms to shirt. 10) when using the joint editor do NOT select an unparented prop while the joint editor window is up. This can assert big time. hope these help.