Weird. It happens every time I add something "external", like importing or merging. It also happens when I reset Max while IR is open.
Happens/happened in Max 2014-2018 and Corona 1.5-1.7.
Floating IR.
I import finished .max files from our object library, as well as .FBX or sometimes .OBJ or 3D DWG. Often from a network location, since our library and project folders are on our network.
Reproduction steps: Have IR running, use max's import or merge, that's really it.
I'm not at work now and I don't know if Windows have a built in screen recorder?, but I'll see what I can do. I can take a screenshot of the crash screen, but it's just a popup. It's a "soft" crash, if that helps. I always get the the "do you want to save a recovery file etc" popup.