I have a problem using logging with external user database. Login and registration work. There is a problem when I want to change the nickname or e-mail user. Both variables example $oldEmail and $newEmail have the same new! value. Variable $member also it has a new value, and I can not appeal to an external database to change email.

The changeEmail issue was supposed to have been fixed in 4.1.11 (and I'm fairly sure the fix did actually work). You will probably need to submit a ticket about it though so that the devs will actually see it.

I solved this by adding to table members column in the style of external_db_user_id
and appropriately modifying the file Login/External.php