I entered several notes and note files were created but they did not get added to the ".notes" file. I assume this was brought about by my system crashing before exiting Memoranda. It appears .notes is not updated until exit,not even when minimized to the tray. If it were updated right after the edit then the data wouldn't be lost.
A related issue: it would be more intuitive if the note file were created as soon as text was entered and not waiting until a different date is selected.