On program load, Undo and Redo are available in the edit menu... Surely they shouldn't be available unless there is something to undo or redo.
Secondly, if I delete a note from a note file, it would be nice to be able to undo that. As far as I can tell your fine if you delete a whole note file since you can restore it from the cloud, but it seems if you accidentally delete a note from within a note file there's no way to undo it.
When I first tried to undo deleting a note I had this crash which I couldn't repeat:
3731.Logos.zip