Hi
I saw someone in the 1.7 daily with the same issue, but it wasn't reported here.
When I render on my workstation + enable the DR and the render finishes, Corona starts the "cleaning up" message. This process never stops. It keeps on running. I am however able to continue to use 3ds max, save my output and everything else (didn't try to rerender though).
When I quit max (2016 sp4) it gave the attached pop up.