Dovecot imap bad quota report

[Carlos Acedo <carlos@pangea.org>]

Hello,

I have dovecot mail server on a Debian etch:
dovecot-common  1.0.rc15-2etch3
dovecot-imapd   1.0.rc15-2etch3
dovecot-pop3d   1.0.rc15-2etch3

It is configured with the quota plugins:

protocol imap {
  mail_plugins = quota imap_quota
  imap_client_workarounds = outlook-idle
}

plugin {
  quota = fs
}

The problem is that I always get used space but not the limit, and the 
limit is not the same for all the users, I have tried from thunderbird 
and horde IMP from another server.

Why is not reporting the quota limit?

Oh, I use mbox for mail storage

Thank you,

Carlos