[Dovecot] deleted messages not going away in Thunderbird?

[Dave McGuire]

   Hi folks.  This may be a dumb question, but I can't seem to find a clue.

   I'm running Dovecot v1.2.9 and Thunderbird v3.1.7.  If I delete 
messages using a different IMAP client (I also use an iPhone and 
occasionally SquirrelMail), I would expect those messages to disappear 
from Thunderbird the next time I start it or click on "Get Mail".  In 
fact, they do...most of the time.  Sometimes, however, they just stick 
around.  If I do a "Repair Folder" on the inbox in Thunderbird, the 
messages go away.

   Is this a known issue?  My gut tells me there's some Thunderbird 
option to make it follow inbox contents with more "attention" but I've 
not been able to find it.

             Thanks,
              -Dave

-- 
Dave McGuire
Port Charlotte, FL