Hi,
I’m wondering if anyone else have noticed this problem. After a couple of minutes or so, IPR stops updating (it doesn’t show any scene changes) and I can no longer stop the IPR rendering. Clicking on the stop button does nothing. I think it happens mainly when I draw regions in the IPR window. Also, when this happens (when IPR stops updating) and then I start a production rendering, Max crashes.
Do send the scene where this behavior is present. If possible, include a reproduction method as well.
Hi, Aleksandar. I’ve just submitted a ticket with number 202893. I’ve also included reproduction steps. Thanks for looking into it! 
A quick update. I’ve just reverted to the previous version of V-Ray (Update 1.2) and I no longer have this problem! Maybe it’s a bug in Update 2?
Hi there,
We wanted to let you know that the issue with the IPR freezing has been reported to the Development team in our internal system - VGPU-6378.
We will inform you as soon as we have any new information about the case.
Have a great day!
Hello. Any progress on this? This bug makes V-Ray GPU practically unusable. 
We are taking a look now
Best,
Muhammed
Thanks! I really appreciate it.