Thanks Michael for the edited code!

What you posted works for me by itself, but when I try incorporating it into the larger thing I'm working on I still have the same kind of problem with undo.

I removed the other instances of moi.geometryDatabase.addObjects() and don't have any object pickers, but the problem persists.

Is there a general principal I can use to troubleshoot this?

- Peer

Hi Peer, it looks like there's a bug where undo can get confused in certain cases if you both add and remove the same object within the same command.

- Michael