dovecot pastas compartilhadas (acl com mysql) não podem ser inscritas

Question

Por alguma razão, a pasta Pastas de Projeto não é selecionável.
Praticamente todas as pastas público ou compartilhadas não podem ser selecionadas.
O cliente de e-mail é o Thunderbird.

#2.1.17:/etc/dovecot/dovecot.conf#OS:Linux3.2.0-4-amd64x86_64Debian7.9auth_debug_passwords=yesauth_mechanisms=plaindigest-md5cram-md5loginauth_socket_path=/var/run/dovecot/auth-userdbauth_verbose_passwords=plaindebug_log_path=/var/log/dovecot/dovecot.debug.logdict{acl=mysql:/etc/dovecot/dovecot-dict-sql.conf.ext}disable_plaintext_auth=nofirst_valid_gid=99first_valid_uid=99hostname=smtp.mydomain.cominfo_log_path=/var/log/mail.infolda_mailbox_autocreate=yeslda_mailbox_autosubscribe=yeslisten=<<my-ip-address>>log_path=/var/log/dovecot/dovecot.loglogin_greeting=Dovecotready,Sir.mail_gid=99mail_location=maildir:~/mail:LAYOUT=fs:INBOX=/var/vmail/%u/mail/mail_plugins=aclmail_uid=99managesieve_notify_capability=mailtomanagesieve_sieve_capability=fileintorejectenvelopeencoded-charactervacationsubaddresscomparator-i;ascii-numericrelationalregeximap4flagscopyincludevariablesbodyenotifyenvironmentmailboxdateihavenamespace{location=maildir:/var/spool/mail/publicprefix=ProjectFolders/separator=/subscriptions=yestype=public}namespace{list=childrenlocation=maildir:~/mail/sharedprefix=shared/%u/separator=/type=shared}namespaceinbox{inbox=yeslocation=mailboxDrafts{special_use=\Drafts}mailboxJunk{special_use=\Junk}mailboxSent{special_use=\Sent}mailbox"Sent Messages" {
    special_use = \Sent
  }
  mailbox Trash {
    special_use = \Trash
  }
  prefix =
  type = private
}
passdb {
  args = /etc/dovecot/dovecot-sql.conf.ext
  driver = sql
}
plugin {
  acl = vfile
  acl_shared_dict = proxy::acl
  mail_log_events = delete undelete expunge copy mailbox_delete mailbox_rename
  mail_log_fields = uid box from subject msgid size
  sieve = ~/.dovecot.sieve
  sieve_after = sieve/vacation.sieve
  sieve_default = /var/lib/dovecot/sieve/default.sieve
  sieve_dir = ~/sieve
  sieve_global_dir = /var/lib/dovecot/sieve/global/
  sieve_max_actions = 128
  sieve_user_log = ~/.dovecot.sieve.log
}
postmaster_address = [email protected]
protocols = " imap sieve pop3"
service auth {
  unix_listener /var/spool/postfix/private/auth {
    mode = 0666
  }
  unix_listener auth-userdb {
    group = postfix
    mode = 0666
    user = postfix
  }
}
service dict {
  unix_listener dict {
    group = vmail
    mode = 0660
    user = vmail
  }
}
service managesieve-login {
  inet_listener sieve {
    port = 4190
  }
  service_count = 1
}
ssl_cert = </etc/dovecot/dovecot.pem
ssl_key = </etc/dovecot/private/dovecot.pem
ssl_protocols = !SSLv2 !SSLv3
submission_host = localhost
userdb {
  args = uid=vmail gid=vmail home=/var/vmail/%u
  driver = static
}
verbose_proctitle = yes
protocol lda {
  mail_plugins = acl sieve acl
}
protocol imap {
  mail_max_userip_connections = 20
  mail_plugins = acl autocreate acl imap_acl
}
protocol sieve {
  mail_max_userip_connections = 10
}