Ok, I've done some more testing and I may have information that may help.
First, I can now confirm that in both about-me and user accounts the change password dialog hangs.
I tried changing the password via the passwd command in the terminal. If I try and change the password for the user account to a new password that contains any part of the old password I get a message that the new password cannot be the same as the old password.
For instance, if my old password was "password123" and my new password is "password456" I get the "The old password cannot be the same as the new password" error using the passwd command.
If, however I do sudo passwd it allows me to change the password from "password123" to "password456" ok.
Maybe that is why the dialogs hang? Hopefully this helps you solve the issue. :)
Ok, I've done some more testing and I may have information that may help.
First, I can now confirm that in both about-me and user accounts the change password dialog hangs.
I tried changing the password via the passwd command in the terminal. If I try and change the password for the user account to a new password that contains any part of the old password I get a message that the new password cannot be the same as the old password.
For instance, if my old password was "password123" and my new password is "password456" I get the "The old password cannot be the same as the new password" error using the passwd command.
If, however I do sudo passwd it allows me to change the password from "password123" to "password456" ok.
Maybe that is why the dialogs hang? Hopefully this helps you solve the issue. :)