[Dovecot] Deleting a message through IMAP

I have been having a problem with the test releases...I am now using Test 59. When I delete a message using SquirrelMail (IMAP) the message stays in the message list....but you can't open it anymore because it can't be found, if I logout and log back in...the message is gone from the list. I thought it could be a problem with the cache, so I added

mail_never_cache_fields = MessagePart Envelope Body

only to recieve

Dec 24 09:23:34 news dovecot: IMAP(admin): mail_never_cache_fields: Invalid cache field name 'Body', ignoring

Any ideas? This problem has plagued me for a while and I always go back to using the and older test like 22 and the problem isn't there...

Doug