[Dovecot] LSUB strangeness continued

Hi,

I wrote earlier to mention that I am having touble with LSUB command reporting "permission denied' on some accounts and not others that are identical as far as I can see. I am trying various combinations of stuff, so i set up a new IMAP account in Thunderbird that went to one of the accounts I am having trouble with. I was not surprised to get "Server says permission denied". I was surprised that after a minute or so, it went ahead downloaded the mail messages? What the heck? Does Thunderbird try another command?

-Don