Each time I select the Edge Boundary checking mode when using a lawn (non detail version) from the default library Max will hang indefinitely.
In this case I selected the 'cut grass field 02 (large)'
I'm using CAD geometry exporterd from ArchiCAD if that helps. It's not a huge scene with lots of edges to check either.
Actually I just selected 'Cut grass field 02 (detail)' to replace the (large) geometry and without changing from Point boundary Max is hanging again. 'Common grass 01 large' set to edge boundary crashes as well..
3DS 2016, Vray 3.6, Win10
This has always been the case too, not something recent