it appears the depth-cue thing must have some bugs. for example, in your scene display (pose room), when you drag your mouse pointer over the depth-cue icon, what name or title appears to the left of the render tab? I've noticed I get rendering errors on occasion, but they disappear after restarting the machine and restarting poser. I believe it's due to poser over-writing some areas of RAM as it gradually uses up more and more.