users of my wpmu install have begun to complain that the usernames they create are not active. i have been getting their registration emails, so I decided to double-check the database. when i do this query for a user named martdl:
SELECT * FROM
user_login = 'martdl'
I get 0 rows, even though I got the e-mail for that username creation.
So, thinking it was a misfire, i try to create a new record by filling out the Add New User form in wp-admin. When I click "Add User", I get the message "ERROR: This username is already registered. Please choose another one."