Re: (sigh) integration cookie problem for all users except admin
korhanekinci, this is a change that I made in the database itself. I use phpmyadmin for database manipulation.
In this case the operation (i.e. the SQL query) was pretty simple, but if you haven’t manipulated the database directly before then it is a little risky. One thing you definitely want to do is to create a backup copy of the db before starting.
I’m working on a test version of my site so there is no risk of damaging the production version.
The SQL query I used:
UPDATE wp_users SET user_login = user_nicename WHERE 1