3.0.0-beta1 delivers mails but doesn't list mailboxes

[Paolo Cravero]

Hello.

> I have a suspicion. Can you please post your imapd.conf and cyrus.conf
> files so I
> can have a look. Also what username you're using to authenticate for
> cyradm,
> and whether your usernames have domains on them.

usernames have domains. (me at example.com, you at uc.example.com)
cyradm has NO domain. (cyrusadmin)

**** cyrus.conf: ****

START {
  recover       cmd="ctl_cyrusdb -r"
  idled         cmd="idled"
}

SERVICES {
  imap          cmd="imapd" listen="imap" prefork=5 maxchild=5000
  pop3          cmd="pop3d" listen="pop3" prefork=3
  sieve         cmd="timsieved" listen="sieve" prefork=0
  lmtp          cmd="lmtpd -a" listen="lmtp" prefork=0
}

EVENTS {
  checkpoint    cmd="ctl_cyrusdb -c" period=30
  delprune      cmd="cyr_expire -E 3 -D 30 -X 30 -v" at=0100
  squatter      cmd="squatter -s -a -i" at=0200
}


*** imapd.conf *** is up on pastebin. 
configdirectory: /var/lib/imap
partition-maildata1: /var/cyrus/maildata/example.com/maildata1
partition-maildata2: /var/cyrus/maildata/uc.example.com/maildata1
partition-maildatadm: /var/cyrus/maildata/admin.invalid/maildatadm
defaultpartition: maildata1

metapartition_files: header index cache expunge squat
metapartition-maildata1: /var/cyrus/metamaildata1
metapartition-maildata2: /var/cyrus/metamaildata2
metapartition-maildatadm: /var/cyrus/metamaildatadm

altnamespace: 0
serverinfo: on
admins: cyrusadmin
loginuseacl: 1
allowplaintext: 1

delete_mode: delayed
expunge_mode: delayed
annotation_definitions: /etc/annoIMAP.conf

sievedir: /var/lib/imap/sieve
postmaster: postmaster at example.com

sendmail: /usr/sbin/sendmail
fulldirhash: 1
hashimapspool: true
sasl_pwcheck_method: saslauthd
sasl_mech_list: PLAIN
allowapop: 0

quotawarn: 80
statuscache: 1
auditlog: 1
debug: 1
chatty: 1
iolog: 1
commandmintimer: 5
normalizeuid: 1
syslog_prefix: cyrus
unixhierarchysep: 1
autocreate_quota: 0
autocreate_inbox_folders: "Junk | Trash | Sent | Drafts | Archive"
autocreate_users: anyone
implicit_owner_rights: l
autocreate_post: 0
expunge_days: 30
singleinstancestore: 1
defaultdomain: admin.invalid
improved_mboxlist_sort: 1
virtdomains: userid
quotadb: skiplist
specialusealways: 1
xlist-junk: Spam

allowusermoves: 1

sync_log: 1
proxy_authname: xyz  # old config, not using it in 3.0.0-beta1 test setup
proxy_password: ***********
unix_group_enable: no