Update! After running the initial CLI.php command AS ROOT, the GUI is back up and running! I disabled the root account for security purposes, so I was running it as my typical admin user account, but that wasn't doing what was needed.
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The runtime version of the Zenarmor Packet Engine is different from the installed version.
It is highly recommended to restart the engine so that it works properly and you can start using the new features.
Do you want to restart the packet engine?
/usr/local/opnsense/mvc/app/library/OPNsense/Zenarmor/CLI.php settimestamp