dovecot - Aug 2014 - Folders don't show up

Hello,

I've upgraded to the new LTS version of Ubuntu. With that comes a new 
dovecot version. I think I've migrated my dovecot configuration 
correctly to the new version. Everything works, except that the 
mailboxes don't show up in the list of mailboxes in my mail clients.

Trying to issue a LIST command, I see the following:

CAPABILITY IMAP4rev1 LITERAL+ SASL-IR LOGIN-REFERRALS ID ENABLE IDLE 
STARTTLS AUTH=PLAIN] Dovecot (Ubuntu) ready.
1 login USERNAME_HERE PASSWORD_HERE
1 OK [CAPABILITY IMAP4rev1 LITERAL+ SASL-IR LOGIN-REFERRALS ID ENABLE 
IDLE SORT SORT=DISPLAY THREAD=REFERENCES THREAD=REFS 
THREAD=ORDEREDSUBJECT MULTIAPPEND URL-PARTIAL CATENATE UNSELECT CHILDREN 
NAMESPACE UIDPLUS LIST-EXTENDED I18NLEVEL=1 CONDSTORE QRESYNC ESEARCH 
ESORT SEARCHRES WITHIN CONTEXT=SEARCH LIST-STATUS SPECIAL-USE BINARY 
MOVE] Logged in
2 LIST "" "*"
* LIST (\HasNoChildren) "
* LIST (\HasNoChildren) "
[SNIP... A bunch of other identical lines... roughly as many as I have 
mailboxes]
* LIST (\HasNoChildren) "
* LIST (\HasNoChildren) "
* LIST (\HasChildren) "
2 OK List completed.

I'm not an IMAP protocol expert, but those answers to the list command 
don't quite look like valid IMAP to me. My imapdir has a bunch of 
maildir directories in it, like a normal imapdir should. Everything 
worked fine with the previous version of dovecot (1.2?). Maybe a dovecot 
bug? At least I don't see how my config could cause this. Any help would 
be appreciated.

The output of "dovecot -n" is included below.

Thanks in advance,

   Christian

----cut here----

# 2.2.9: /etc/dovecot/dovecot.conf
# OS: Linux 3.13.0-34-generic i686 Ubuntu 14.04.1 LTS
mail_location = maildir:~/IMAPdir:LAYOUT=imapdir
mail_plugins = fts fts_squat
passdb {
   args = scheme=SHA512-CRYPT username_format=%u /etc/dovecot/users
   driver = passwd-file
}
plugin {
   fts = squat
   fts_squat = partial=4 full=10
   sieve = ~/.dovecot.sieve
   sieve_dir = ~/sieve
}
protocols = " imap"
service auth {
   unix_listener /var/spool/postfix/private/auth {
     group = postfix
     mode = 0660
     user = postfix
   }
}
service imap {
   vsz_limit = 2 G
}
ssl_cert = </etc/ssl/certs/cert.pem
ssl_cipher_list = 
ECDHE-RSA-AES128-GCM-SHA256:ECDHE-ECDSA-AES128-GCM-SHA256:ECDHE-RSA-AES256-GCM-SHA384:ECDHE-ECDSA-AES256-GCM-SHA384:DHE-RSA-AES128-GCM-SHA256:DHE-DSS-AES128-GCM-SHA256:kEDH+AESGCM:ECDHE-RSA-AES128-SHA256:ECDHE-ECDSA-AES128-SHA256:ECDHE-RSA-AES128-SHA:ECDHE-ECDSA-AES128-SHA:ECDHE-RSA-AES256-SHA384:ECDHE-ECDSA-AES256-SHA384:ECDHE-RSA-AES256-SHA:ECDHE-ECDSA-AES256-SHA:DHE-RSA-AES128-SHA256:DHE-RSA-AES128-SHA:DHE-DSS-AES128-SHA256:DHE-RSA-AES256-SHA256:DHE-DSS-AES256-SHA:DHE-RSA-AES256-SHA:!aNULL:!eNULL:!EXPORT:!DES:!RC4:!3DES:!MD5:!PSK
ssl_dh_parameters_length = 2048
ssl_key = </etc/ssl/private/ssl.key
ssl_prefer_server_ciphers = yes
userdb {
   driver = passwd
}