in the attached file I started with a simple set of selected control points and saved it as a named selection. Then I made a copy of the object and from there on the named selections count double with further modeling steps. I’ve tried to delete all named selections which crashed Rhino on a more complex file. NamedSelectionBug.3dm (271.3 KB)
@Jess thanks this is currently a known bug. I’ll be working on NamedSelections again around December and hope to take care of several outstanding issues with them.