dovecot - Sep 2012 - strange Folder in subscription list (was: Imap Ghost Folder)

Hi list,
here's the complete Problem for easy reading again.
Can someone reproduce this?

I have a strange "ghostfolder" when using
shares/%%n/
as prefix for shared namespace.
If i swith only this setting to
shares/%%u/
everything is just as wanted, only then the prefix is very long, so i 
would prefer the name.



dovecot --version
2.1.7

dovecot -n
# 2.1.7: /etc/dovecot/dovecot.conf
# OS: Linux 2.6.32-14-pve i686 Debian 6.0.5 simfs
auth_mechanisms = plain login
disable_plaintext_auth = no
log_timestamp = "%Y-%m-%d %H:%M:%S "
mail_location = maildir:/var/vmail/%%d/%%n/Maildir
mail_plugins = acl
mail_privileged_group = vmail
managesieve_notify_capability = mailto
managesieve_sieve_capability = fileinto reject envelope 
encoded-character vacation subaddress comparator-i;ascii-numeric 
relational regex imap4flags copy include variables body enotify 
environment mailbox date ihave
namespace {
   inbox = yes
   location    prefix    separator = /
   type = private
}
namespace {
   hidden = yes
   list = children
   location = 
maildir:/var/vmail/%%d/%%n/Maildir:INDEX=/var/vmail/%d/%n/Maildir/shared/%%u 

   prefix = shares/%%n/
   separator = /
   subscriptions = no
   type = shared
}
passdb {
   args = /etc/dovecot/dovecot-sql.conf
   driver = sql
}
plugin {
   acl = vfile
   acl_shared_dict = file:/var/lib/dovecot/db/shared-mailboxes.db
   quota = dict:user::file:/var/vmail/%d/%n/.quotausage
   sieve = /var/vmail/%d/%n/.sieve
}
protocols = imap pop3 sieve
service auth {
   unix_listener /var/spool/postfix/private/auth {
     group = postfix
     mode = 0660
     user = postfix
   }
   unix_listener auth-userdb {
     group = vmail
     mode = 0600
     user = vmail
   }
   user = root
}
ssl_cert = </etc/postfix/smtpd.cert
ssl_key = </etc/postfix/smtpd.key
userdb {
   args = /etc/dovecot/dovecot-sql.conf
   driver = sql
}
protocol pop3 {
   mail_plugins = quota
   pop3_uidl_format = %08Xu%08Xv
}
protocol lda {
   mail_plugins = sieve quota
}
protocol imap {
   mail_plugins = quota imap_quota acl imap_acl
}


Thank you very much for your help
Sascha

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