HI i've watched this screencast : http://vimeo.com/68893840 and i really love the debug interface, so i tried to make it work.
I've started a new project (as i'm a new phalcon user ;)) with this doc : http://docs.phalconphp.com/en/latest/reference/tutorial.html#creating-a-project and i stopped after IndexController.
It displays "Hello" like it's supposed to do, so i've add an error in the echo (i've deleted the ";" at the end of the line), as expected i've an error : http://imgur.com/F1xdAQM , then i write the line
php (new Phalcon\Debug)->listen(); in public/index.php at the beginning of the file, but i still have the crappy orange error message instead of your interface.
What did i forgot ?