Updating a fresh working symfony standard 2.3.2 stable to 2.3.x-dev fbb78ec (minimum-stability: stable->dev) gives a 500 error on loading web debug toolbar (app_dev.php). Opening the profiler shows: 1/1 UnexpectedValueException: The profiler template "SecurityBundle:Collector:security.html.twig" for data collector "security" does not exist.