Maybe you are right. I understood that bucket size has to do with how much memory is used during a render. Maybe it just goes too far and memory problems appear. It sounds like more than just one thing can do it too. I've used bucket sizes of 300 before, and I don't think I was even pushing it this time. However, lower it back down, and it works. Would a ram manager fix this? I don't know anything about stuff like that.