maildir enabled en then disabled, not posible to get messages pop3 after this

The pop3 server was working fine, and now this..
its make me crasy, i enabled maildir in the admin from ispconfig.
It was a mistake i disabled it, and now pop3 cant find messages from users..
when i look in webmin there is mail. Why the pop3 not working anymore?
Help me please..

 

I'm using ispconfig with postfix, i think i do this good?

I put maildir on now, pop3 working again, is this the good way?
Is it posible to configure webmin to see the messages?

 

Which POP3 daemon do you use? Please post the output of

Code:

netstat -tap