Valander: It doesn't happen often with the standard Poser, but if you have ProPack, try rendering Michael 2 or Vicky 2 with very high res maps (3500 pixels wide or more), some clothing (textured) and hair, and you will probably see it sooner or later ;) It is clearly memory-related or memory allocation related, but doesn't seem to be just an issue of RAM or hard drive space.