I have been having a problem with auto-adding books stopping. I leave Calibre running all the time so I can access my library away from home. If I start Calibre auto-adding works fine. If I add books to the designated folder later in the day or the next, auto-adding does not recognize or import them. I have to restart Calibre every time I want to use auto add. I have the most current python version, most current Calibre and all Win10 updates.