Kmail: fetching GMail over IMAP

Dear all, I have recently set up KMail to fetch a GMail account over IMAP protocol. However, I am experiencing an issue that does not happen with any of my other IMAP accounts. Very often when I fetch new email and mark it as read locally, the next time emails are fetched this mail is locally marked as unread, instead of being marked as read on the server. Is any of you experiencing similar issues with GMail? Is this just a matter of setting appropriate options in GMail and, if so, which ones? Janek --- Politechnika Łódzka Lodz University of Technology Treść tej wiadomości zawiera informacje przeznaczone tylko dla adresata. Jeżeli nie jesteście Państwo jej adresatem, bądź otrzymaliście ją przez pomyłkę prosimy o powiadomienie o tym nadawcy oraz trwałe jej usunięcie. This email contains information intended solely for the use of the individual to whom it is addressed. If you are not the intended recipient or if you have received this message in error, please notify the sender and delete it from your system.