I have a scene with a few geometry vol fog gizmos which renders fine.
When I click merge in the Environment tab and select the same scene to duplicate my EnvFog effect it seems to merge fine - although no gizmos is now attached to that effect. When I select the merged effect and click Add under the Gizmo tab max crashes.
Edit:
It seems a bit random now when I remove and add gizmos which ones will be active when rendered.
1) I made a simple scene. I think falloff radius didnt work (only new falloff per gizmo)
2) In this scene, make one environmental fog in one gizmo, then make another envfog and apply another object as a gizmo. But when I switch to the first envfog, it has the second object as a gizmo. I think its a bug, becose its render ok in both gizmos, but in the menu objects is wrong in the list and when I wanna change these objects, remove or add, vray crash.