hi there,
I got exactly the same issue with a new joomla installation after installed one of your templates: No way to get in the template admin-area: Fatal error: .......components/com_gantry/admin/phpQuery.php on line 1421.
Hoster: STRATO AG.
Thank you Robert, I used your advice to roll back to Gantry 3.0.11 > and it works!