Reasons for google analytics module not working?

I am trying to use the Google Analytics Module https://github.com/MattTuttle/titanium-google-analytics for my iPhone app. Everything seems to be setup correctly without any problems in the log:

Titanium SDK 3.1.1.GA

tiapp.xml

<module platform="iphone">analytics.google</module>

app.js

var GA = require('analytics.google');
GA.debug = true;
GA.trackUncaughtExceptions = true;
var tracker = GA.getTracker("UA-XXXXXXX-1"); //replaced with actual Property-ID
tracker.trackEvent({
    category: "App Behavior",
    action: "started App",
    label: "User started app",
    value: "username"
});

In Google Analytics I added an acoount for an app (you can choose between website and app) and integrated the Property-ID in the code above.

I integrated it 5 days ago and used the simulator with the code several times but dont have any updates at all in google analytics.

Anyone an idea what could be the cause?

Thanks!