to AeroJett

I know there is a file size restriction in Bryce, that is you can't save more than 2 Gb file, otherwise it will crash. Rashadcarter, a friend here, advice is to keep open the task manager windows so to keep under control the RAM usage..
The rule I know if you go say 1.4 Gb its risky to save.
One possible solution is to use polygon reducing tecnique.
I use either "quem loss " plugin in Lightwave modeler or the "decimator" plugin in Zbrush.