I have the same problem. Other threads here have said that it's a Windows '98 program. The way '98 handles ram doesn't free up enough for Poser to do large renders. I'm hoping that Poser 5.0 has a better rendering engine. Others here have said that upgrading to XP will fix the problem. Daz says that a memory management utility should do the trick, but I have Memo boost and I still have trouble with rendering large images. I'll check out Poser 5 when it's available, if that doesn't solve the problem I will probably simply have to upgrade to XP, though I'm afraid of headaches.