While this is probably not hien's problem, I do know a case where this can happen. On some PCs (like my Pentium-D DP 2.8/WinXPro/2Gig), if the screen saver kicks in or the PC goes into Sleep Mode, B6 render speeds slows dramatically, say on the order of -90%. This will continue to happen until you reload Bryce.You can tell when this happens because you have to wait a long time or make many clicks to get the render to stop. I just turn all that stuff off and kill the monitor with it's off switch on long renders. This doesn't present a problem on a P4 SP 2.8/WinXPro/1Gig. Go figure... Best; Dan