Just an obnoxious idea, but perhaps it's ME in general? I mean, given your intense and awesome work, this shouldn't be the problem. Perhaps try rendering it on Win98 or something? Are you rendering to disk or to screen? Having just rendered a silly castle scene for 3 days, I can't understand why Bryce 5 would crash. Methinks it's a Windows issue? Granted, my scene only had a few lights, but the water texture drove this machine to it's knees. Have you tried to use Lightning on this one?