I'm having the same exact problem. poser never gets to the rendering. It hangs while doing the shadow map. I cut done the amount of lights casting shadows. (3 only 1 casts shadows) and it now hangs while adding objects. I'm running XP with 512 MB and a 1G athlon. Task manager says i have tons of memory left 300 MB+ it also says poser still uses about 97% of the cpu cycle for hours on end. It does not tell me that poser has stopped responding. This problem did not appear that I now of before SR3. I've played with just about ever setting there is. PS this is using the Firefly render not the older "poser" renderer.