I have a user who thinks he accidentally hit the “Do Not Load” on a Lisp Routine when loading and now it will not load. It seems AutoCAD is keeping that stored somewhere in this software/registry. The lisp seems blocked from loading in Civil 3d but not in Civil 3d for AutoCAD. It works fine in Civil 3d for AutoCAD.
He gets this error message when he tries to load the lisp. Maybe it is something else??