After upgrading from 1.3.0 to 2.2.0, any existing users are unable to be changed as an error message saying the email address is already in use is shown.
Any new users created in 2.2.0 are editable as normal.
atrol
2017-03-03 10:44
developer ~0055896
Add the following line to file config_inc.php
$g_email_ensure_unique = OFF;
