I have been successfully logging into my gmail account for years from Thunderbird. Now it stopped working. (Two other non-gmail accounts continue to work.) When it tries to retrieve the email, a google login-request pops up with the email address already filled in, but when I hit "next" it reopens the dialog without the email address and if I fill it in and click "next" it just deletes it again and requests it again. I can log in to google with that address from my browser without issues. Bit that login does not carry through to thunderbird, which continues as above. There is a popup complaining about an authentication problem. I am using OAuth2 (and SSL/TLS, if that is relevant). I have tried deleting the history and cookies with no change. I believe there may have been a Windows 10 update between the working/not working periods, but I'm not positive of that timing.

Thanks, Alex