ghelmer, judging how you listed your events, I'm gonna add one of my rules to the "save before render" rule. And that would be, "Slow Down". Rooted in experience and watered with superstition I have witnessed many crashes come when I am in a hurry. So far, P7 hasn't crashed when I cancelled a render but I'm also in the habit of waiting for it to dump its memory. It's not completely scientific and yet many hangs and crashes come when I have tried to press too many buttons too quickly. There are many kooky things going on in P7.