Corona doesn't render anymore - how to reset?

Hello,
after some trouble with a file and a crash of 3dsMax, Corona isn’t rendering anything at all and needs several minutes to stop
I opened also another file from yesterday to check…

I guess something in the preferences has been destroyed.
What is recommended to solve this?
Install again over it? or deinstall first? Or are there preferences to delete?

Thanks again

Might be a stupid question, but is there some lights in your scene? Can you show VFB’s stats tab while rendering?

Yes, both scenes rendered before properly as they are.
The scene from yesterday was already a double-check.

Hi. First thing to do, is to switch over to “Beaty” (you’re in Lightmix). If this is black too, then check your lights and maybe exposure.

Hope it helps

Hi,
I found the reason - you wouldn’t get on that idea :smiley:
In the background was Maya still silently running with Vray-IPR on.
As soon as I switched it off, Corona worked again.

Cheers
(& thanks for your replies..)