I'm trying to IPR a relatively medium size seen(fog and some point lights, with shadows). Usually if I try to refresh the IPR it freezes my system. I've tried a couple of things but it still freezes(it seems like if I save then IPR right after it freezes more often, but could be voodoo)My system 2.4,geforce 4, 1gig of ram. It seems like I have plenty of ram. Any suggestions?