Postfix does not recognize the passwd from ISPConfig webform

Hi

Running ISPconfig 3 on my debian vps. Now I wanted to change a users password using ispconfig webpage (email mailbox).
When Im using the page to change password, everything is fine. But when the user connects using his mail client, the server spews out this message:
SASL LOGIN authentication failed:

So what is going on? I have tried my self as well, and the new password does not work. This is a pop3-account if that helps.

 

I actually had to delete the user and re-add it to make the password work. And when I logged in again, I got a lot of mails like this:
Subject: 12.07.2015-01:30 - DEBUG - Remove Lock: /usr/local...
Body: 12.07.2015-01:31 - DEBUG - Set Lock: /usr/local/ispconfig/server/temp/.ispconfig_lock
12.07.2015-01:31 - DEBUG - Calling function 'user_insert' from plugin 'mail_plugin' raised by event 'mail_user_insert'.
12.07.2015-01:31 - DEBUG - Created Maildir /var/vmail/somedomain.net/someUSER/Maildir with subfolder: Sent
12.07.2015-01:31 - DEBUG - Mailfilter config has been changed
12.07.2015-01:31 - DEBUG - Found 1 addresses at all.
12.07.2015-01:33 - DEBUG - Set Lock: /usr/local/ispconfig/server/temp/.ispconfig_lock


???

 

Yeah, sorry about that one. One google search with the output fixed that one. But stille. Is it normal to delete users to make new passwords work?