Problem with marking messages as seen

[Mufit Eribol]

I just installed FC3,  postfix-2.1.5, cyrus-imapd-2.2.10, 
cyrus-sasl-2.1.19,  mysql-3.23.58 as per Postfix-Cyrus-Web-cyradm-HOWTO 
of Luc de Louw. All authentication issues seem working OK.

I am new to imap and cyrus. Perhaps it is a simple issue, but I don't know.

How come some of the messages in INBOX insist on being unseen. I read 
and mark them as read. But later on, when I check for the new mails, 
these messages automatically reverts back to unread condition. How 
should I read them to mark as read? :) Also, this problem doesn't apply 
to all the messages in INBOX, just some of them.

Thanks for any hint.
Mufit


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