[Dovecot] 1.0-test55, threading does not include new messages

Hello.

The dovecot server is 1.0-test55, with maildir storage. The MUA is pine 4.61, using thread sort.

When I open a folder containing new messages (delivered through procmail), the threads do not include these messages. I have to close the folder, then open it again to make the threads complete.

Thanks in advance.

-- Nicolas