If you click cancel in userpasswd, either immediately or after going through a
step or two, you get an error dialog reading 'Unknown Error'.
I'm not sure if the bug I just encountered is the same as this; maybe the error
has just changed.
I have components:
1. Log in to the desktop as a user
2. Run /usr/bin/redhat-config-packages
3. Press the Cancel button
"The password you typed is invalid" dialog appears
Pressing ESCAPE works as expected, though.
This is related to bug #75834.
This is now fixed in recent usermode.