Root password reset to default after reboot
I had to change my root password. So I've connected to SSH, went to the shell, typed passwd and put the new password. Everything worked great until I had to reboot my firewall. After rebooting, the old password was back.
The admin user in the GUI is also the root user in the shell (as well as the admin user there)
To change the root password, you must change the admin password in the GUI, and root will follow.
The password is synchronized to the OS from the config.xml version at bootup, so any changes you make in the shell alone will not survive a reboot.