dovecot - Oct 2012 - public mailbox not showing up in web client

Hello,

I'm trying to set up a public mailbox where users can receive
notifications out of. I'm not getting any errors from Dovecot 2.1, but
nothing is showing up in my user's web clients. In each
/home/vmail/public/mailbox folder right now I just have one called
testbox I have a dovecot-acl file with:

user=testuser1 lr
user=user1 lr

etc.

I'd appreciate any suggestions.

Thanks.
Dave.

# 2.1.10: /etc/dovecot/dovecot.conf
# OS: Linux
dict {
  quota = mysql:/etc/dovecot/dovecot-dict-sql.conf.ext
}
first_valid_gid = 5000
first_valid_uid = 5000
hostname = xxx
last_valid_gid = 5000
last_valid_uid = 5000
log_path = /var/log/dovecot.error
mail_gid = vmail
mail_home = /home/vmail/%d/%n/home
mail_location = maildir:/home/vmail/%d/%n:LAYOUT=fs
mail_plugins = " acl quota zlib"
mail_uid = vmail
maildir_very_dirty_syncs = yes
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 {
  list = yes
  location = maildir:/home/vmail/public:LAYOUT=fs
  prefix = Public/
  separator = /
  subscriptions = yes
  type = public
}
namespace inbox {
  hidden = no
  inbox = yes
  list = yes
  location   prefix   separator = /
  subscriptions = yes
  type = private
}
passdb {
  args = /etc/dovecot/dovecot-sql.conf.ext
  driver = sql
}
plugin {
  acl = vfile
  autocreate = Spam
  autosubscribe = Spam
  quota = dict:User quota::proxy::quota
  quota_rule = *:storage=1G
  quota_rule2 = Trash:storage=+100M
  quota_warning = storage=95%% quota-warning 95 %u
  quota_warning2 = storage=80%% quota-warning 80 %u
}
postmaster_address = postmaster at xxx
protocols = imap
service auth {
  unix_listener /var/spool/postfix/private/auth {
    group = postfix
    mode = 0660
    user = postfix
  }
  unix_listener auth-userdb {
    mode = 0600
    user = vmail
  }
}
service dict {
  unix_listener dict {
    mode = 0600
    user = vmail
  }
}
service imap-login {
  inet_listener imap {
    address = 127.0.0.1 ::1
  }
  inet_listener imaps {
    address = xxx xxx
    ssl = yes
  }
}
service quota-warning {
  executable = script /usr/local/bin/quota-warning.sh
  user = vmail
}
ssl_cert = </etc/ssl/certs/server.crt
ssl_key = </etc/ssl/private/server.key
userdb {
  args = /etc/dovecot/dovecot-sql.conf.ext
  driver = sql
}
protocol lda {
  mail_plugins = " acl quota zlib"
}
protocol imap {
  mail_plugins = " acl quota zlib autocreate imap_acl imap_quota
imap_zlib"
}