dovecot - Nov 2010 - 2.0.7: emails read emails become unread

Hi

My users are reporting that in public folders, emails that were past
read suddenly got unread, sometimes even after marking them as read
again. Didn't have such problems with 2.0.6 I think.

My dovecot -n:

# 2.0.7: /usr/local/etc/dovecot/dovecot.conf
# OS: Linux 2.6.26-2-xen-amd64 x86_64 Debian 5.0.6
auth_mechanisms = plain login
disable_plaintext_auth = no
listen = *
mail_location = maildir:~/Maildir
mail_plugins = acl
maildir_very_dirty_syncs = yes
namespace {
  inbox = yes
  location   prefix   separator = .
  type = private
}
namespace {
  location = maildir:/home/_shared/projects:INDEX=~/Maildir/_shared
  prefix = shared.
  separator = .
  subscriptions = no
  type = public
}
passdb {
  driver = pam
}
plugin {
  acl = vfile
  mail_log_events = delete undelete expunge copy mailbox_delete
mailbox_rename flag_change append
  mail_log_fields = uid box msgid from subject size vsize flags
  mail_log_group_events = yes
}
protocols = imap pop3
service imap {
  executable = imap
}
ssl_cert = </etc/ssl/certs/dovecot.pem
ssl_key = </etc/ssl/private/dovecot.pem
userdb {
  driver = passwd
}
verbose_proctitle = yes
protocol imap {
  mail_max_userip_connections = 40
  mail_plugins = acl imap_acl
}

On Tue, 2010-11-16 at 12:32 +0100, K?d?r Tam?s (KTamas) wrote:
> My users are reporting that in public folders, emails that were past
> read suddenly got unread, sometimes even after marking them as read
> again. 
Any errors in Dovecot's logs?
> Didn't have such problems with 2.0.6 I think.
I don't think I've changed anything related to this..
> namespace {
>   location = maildir:/home/_shared/projects:INDEX=~/Maildir/_shared
You do have dovecot-shared files for all those folders
in /home/_shared/projects/, right?

Anyway, losing seen flags for shared mailboxes basically means that
Dovecot ignored/lost the index files in ~/Maildir/_shared/ for some
reason.