happens to me as well with max 9, not only chamfer, but crossing 2sidedmaterial also crash. sometimes moving vertex also crash. i gave up and save alot..
Ok, found a work around for you. Dont know WHY it work but it does.
Select the mesh, switch from single viewport to quad viewports (press the maximum viewport button… bottom right hand corner) then press it again to go back to a single viewport, then your chamfer will work :shock:
Btw i just downloaded ure scene and it crash when i try to chamfer any edge…but it crash when you work in poly mode…
I converted your poly in mesh and i can chamfer as i want your object
try it!!!
after you can come back in a poly object
talking about power booleans or polyboost here? might be a dumb question, but i was considering buying the polyboost, but since i read this post i am not so sure…