Not working when running as root on a raspberry pi

[VittorioAccomazzi]

I love this package and I always used in my applications. However I recently ran into a problem: while developing an application on my mac and my raspberry pi on port 8080 the package worked properly. Afterwards I deployed the application in a raspberry pi on port 80 as root. At that point the package doesn't display anything at all as shown below:

You can notice from the picture that I'm using an ssh tunnel, but that should not cause any problem, I have used extensively in the past.

Can you please suggest how can I get it to work ? is it perhaps an issue of permission ?