[Dovecot] help: The current command did not succeed. The mail server responded: Invalid mask.

Am tryin to move from uw-imapd to dovecot, using dovecot ver 0.99.10.4. Reading with Mozilla Mail v 1.4.

I made some test accounts and they seem to be working fine, but my older existing accounts give error messages whenever I connect or subscribe to mailboxes within them. The message that appears on the client is:

"The current command did not succeed. The mail server responded: Invalid mask."

it appears two or three times in an alert box (on windows) then everything seems to work.

The masks (I've put a syslog call into the code) are: "~%", "~%~%" and "~*". The test accounts I created don't have this problem.

Thanks in advance for any advice,

-- Bodo Gelbe