Vray 3.50.04 IPR and forest pack issue in 3ds Max 2016 sp4

I love the ipr feature, but when I add forest pack content while in IPR MAX will crash before the IPR can update. I also got it to crash when I added a VRdisplacement modifier while in IPR. Anyone else running into this?

Which version of Forest Pack do you have?

Best regards,
Vlado

Forest Pro 5.1.0

Hello
only the current Forest 5.3 version is dedicated to vray 3.5.