[Typo3] Bug in front end user registration???

[Kimmo Helle]

Hi all,

Yesterday I started receiving mails about users registering without any
names so I took a look what might be wrong. Registration went smoothly until
you finally push the "create user account now" ( <-- not sure about this
translation) button I got this error message:

Access denied for user: 'user2 at localhost' to database 'user1'
Warning: Cannot modify header information - headers already sent by (output
started at 
/home/paitsio/public_html/typo3conf/ext/sr_feuser_register/pi1/class.tx_srfe
userregister_pi1.php:826) in
/home/paitsio/public_html/tslib/class.tslib_fe.php on line 2402

I noticed that this message came up while trying to update a profile as
well.

Intresting thing is that why is access denied for user2? I have never set
this to anywhere as the logon name in install settings is user1.

Cheers,
Kimmo