[Dovecot] "select NULL as password..." failing after upgrade to dovecot-1.1

Hi, I've upgraded mail server to dovecot-1.1, on solaris-10 with mysql user database. I used sql query "SELECT NULL as password, login as user, concat('/mail/var/dovecot/',login) AS userdb_home, 501 AS userdb_uid, 501 AS userdb_gid FROM users WHERE login='%n' AND password=old_password('%w')" with dovecot-1.0.15 and it worked perfectly. But since upgrade the server can not authenticate any users, complaining in info_log: "Empty password returned without no_password". How to set up such things in dovecot-1.1? Is it possible?

Sergey Ivanov.