I think the answer is definitely RAM. W98SE runs various housekeeping tasks in the background when the users are't looking, if jade had a whopping Bryce file open when Windows was performing any kind of write-back file operation, that would account for the loss. If there isn't enough RAM, then Windows pages out to virtual memory, and to cut a long story short, that's when you get problems - often. It is possible to set Windows so that it doesn't do these things when you don't want it to, but the best answer is more RAM. The other temporary solution is to create smaller files, save them as bryce object files, work on each of the smaller components seperately, and only bring them together when you render. If you look on my gallery, you'll see an image of a sand galleon. I did that with only 64MB of RAM under Win98SE in Bryce 3 by the above method regards peejay