logging into Piwik mobile on IOS 7

I installed Piwik mobile on my IOS 7 powered iphone 4s and am trying to log in with my super user account but Piwik mobile says:

You can'T access this ressource as it requires an View acccess for at least one website.

Seems nonsensical to me since I always log in to my Piwik installation via the super user and I can see all websites...

Any adviceß