My render is stuck at “building acc. structure” - I pressed cancel/esc/stop and the button is “blacked out”, but it just keeps calculating. Forgot to save my last changes, and I was only doing a quick test-render, so I don’t was to force a shut-down :S
Any magic button? or do I have to wait for it to be finnished?
You can still save the scene by the way.
And then crush the 3ds max proces.
And long ACC might be caused by overtuned displacement.
Brainfart, I actually tried to close it and got the “save/dont save” window up - but the idea to save while rendering never crossed my mind…
Thanks for the help, it worked! 
Please let us know if the “building…” freeze was a one time thing, or if it happens to you frequently. It could be a bug, or some known problem.
Are you getting any error messages/warnings from Corona?
I can only remember it happening once before, so not really a big problem atm.
Only thing that comes to mind is that I had a couple of vray object imported and I hadn’t converted it before I pressed render. No error message popped up.