[MlMt] Mailbox stops updating

[Ben Beuchler]

Since the new update came out, I've had problems with my IMAP
mailboxes no longer updating, even if I right click on the mailbox and
choose "Synchronize INBOX."  If I restart MailMate, the new messages
suddenly become visible.

I haven't changed the config or the IMAP server.  The synchronization
schedule is set to "Connected" and the mailbox panel does not indicate
the mailbox is offline.

What can I do to gather more debugging information?

Version:  1.7(3790)

-Ben