Undo not working

Two of my coworkers and I are having issues where the undo will selectively work. It will sometimes allow me to undo things I have done and at other times it won’t let me. Sometimes it is the first undo in a series and sometimes it will be the third or fourth.

It would be very helpful when you could reproduce it. Can you redo the same actions and “break” the undo after you restarted Glyphs? the problem is that it could have been something you did a while ago.

Do you use some scripts or plugins?