I got the same problem as danyf
i got also a e-mail from users that there can not reset the password
it goes to a enlose loop insert new password the site loads again and so on
and when i trying to modified the password on the backend panel and sent the new password to the user that there can login with this new password i sent.
the user trying to login with the password i sent and it also not work and specially after that the account are complett removed ???
i have deactivated the Pie login and use now the standart login with some add on select on the register panel and it works for me
register – login – logout – forget password – reset password and login again works on my default wp-login