This is actually a bug in the way that cPanel handle's our theme it looks like. I'm going to try to get this information passed through the proper channels to see if this can be fully fixed.
For now you should be able to login directly to cPanel, then under the Mail section, click on Email accounts. From here you can click on change password to update the password for any account.
As a work around for allowing users themselves to update their own passwords you should be able to follow these steps.
Hope that information helps, please let us know if you're still having any issues getting this working.
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