Thank you for the response. I hadn't reviewed the test file, and it does function normally there, except when I try to glue a rectangle primitive in that file, Max still crashes for me. However if I create a rectangular line object, it works fine. I now believe my problem is working with splines that are layer objects imported from AutoCAD, if I snap a new Max line object to those splines, it glues down no problem. Again thanks for a reply that I think pointed me in the right direction.