webmail login fails for all users after account move

We moved an account from one server to another using pkgacct and everything went smooth. Seems now that users cannot login via their email address and password when trying to use webmail but it works fine for pop3.
Going to www.domain.com/webmail and using the user and pass, it keeps
asking for the password over and over.

This affects ALL 30 email accounts on that cpanel account.

Anyone have this problem?. We have to move more accounts and I am worried this will happen again.