Here's another personal bug...double clicking on a pz3 to open after a freeze and reboot will draw a freeze (do not understand why)! Right click and hit open on Pz3 sometimes skips this annoyance. Also when changing camera, you can make invisible all that is not in the viewer. This can clip you down under the max with no scene loss. Quick in hierarchy editor. I'm experienced and have at least 1000freezes to my credit...? Blowing your RAM and processor off with compressed air will make a few more renders.