As of yesterday there is a issue on both my computers. Email does not get send. If you create a email and then press send the window somewhat dimes and nothing happens. It is possible to save the email in the concepts folder after the message window is closed. Secondly Cardbook behaves funny. If you select a group no contacts are shown at all. Only if you select the address book contacts are shown. I retrieve my 300 contacts from a NextCloud server. I depend havily on as being active in two different bridge clubs. When I watched the Cardbook screen I saw that the contact were not updated. It happened when I manually started the process. I hope for a solution because I use mass mailing with Thunderbird.