Hi there,
Not really a bug, but an annoying behavior.
I'm used to have a Corona IR as my 4th viewport view.
And i DO have to think about to stop it before i drag&drop a max file to merge.
I understand that Corona does not espect for such changes in the polygons list, but if i don't stop IR first, 3dsmax hangs, then crash.
If it is normal that Corona can't handle new polys list when we merge a scene, maybe you could force the IR stop when you know that we are trying to open or merge a new scene ?
Best regards.