Comment 8 for bug 1290808

To summ up all information:

Issue-1: "change" button is active by default when it should only work once the infos are entered

Issue-2: User promted to enter password and can proceed successfully without entering password. See steps below:
1. Navigate to the System Settings
2. Choose User Accounts
3. Click on Password field to change user password (without unlocking)
4. Enter correctly old password and New password (make sure you know it and can remember for later use) and Confirmation for new password and click "Change" button again
!!!On the next step your password will be changed to the new one entered abowe
5. When asked for password click cancel and do not enter your current password
Actual result:
5. User was asked for password, but proceed successfully without entering password