Have you tried Rendering the Animation to Disk? I've had similar problems on large files and turns out I ddint have enough memory to Run Bryce and keep the animation from rendering.. This is a VERY rare thing to happen, but that may be a problem solution. (I havent heard of anyone else with my problem, so what the hell) I'm 98% sure this isnt the case, but it's worth a shot. Best regards, -Matt