Hi there, I have already submit a request about this issue (internal system VMAX-13963) but maybe theres someone else that has the same issue and dont know whats happening.
Im having issues rendering with IPR while editing materiales on ForestPack objects, I have already sent this issue to iToo but they had told me that this is a Vray error according the minidump from 3ds Max.
Ive reproduced this error on a simple scene with a plane and grass preset, in my tests 3ds Max crashes as soon I do a single change or select something in the material from the FP Object.
Ive tested on different Vray 6 (stable -nightly) / ForestPack 8 builds and the error still ocurrs, also I have updated 3ds Max to 24.2.1 and ForestPack 8.2.6 and the issue ramains.
Heres the Link for the Video and the File showing the problem.