[Dovecot] upgrade to 1.1 and mail location

I recently upgraded from 1.0.8 to 1.1-11

the only thing that was changed in the config file was the new syntax for mail location.

default_mail_env = mbox:~/:INBOX=~/mbox

to

mail_location = mbox:~/:INBOX=~/mbox

now some imap clients, like squirrellmail and pine have difficulties writting to Sent, Draft and sent-mail folders. In all cases the folders are visible and are present in .subsriptions file( although not seen as subscribed in squirrelmail), but the clients complain that folders already exist when trying to write to them after sending.

has anyone run into this ? any suggestions ? thanks a lot.