Lately, Acad/C3d has been crashing a lot, seems to be happening when autosave kicks in, -- but it will become unresponsive, and eventually become terminal, usually with a CER dialog.
After than I have to use Task manager to close it,.. When I reboot after the crash, this message pops up for several seconds, and then shuts down and restarts. Sicne the PC was hung, I had to shoot the pic with my phone