users can not change their password

Hi,
I've just installed sqwebmail 4.0.1. Webmail users can not change their
password and get an error message

user invalid username
ERROR: Unable to change password. Possible reasons why you cannot change the
password are:
You did not enter the old password correctly
You did not enter the new password twice correctly
Your new password is too short, or is based on a dictionary word, and
short/dictionary-based passwords are not allowed
Your new password is the same as one or more previous passwords, or the
minimum time between password changes has not yet elapsed

I have configured sqwebmail with-authvhkpw and my server uses vpopmail 5.0.
I did not configured it as "--disable-changepass". What is the problem?

Thanks...

Özgür ÖZASLAN
http://ozaslan.ifbim.itu.edu.tr



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