Perhaps this is the issue Nicola: You select a path for production AND THEN you set the WebViewer to companionPath. Does that make sense; obviously you should set the WebViewer to the path required use to build the apk. You probably do not want to set the WebViewer to GotToUrl; what you want is the WebViewer to use a HomeURL that points to the production path.
Try that? You might want to 'fix' your Blocks.
You might look at the example Make an Analog Gauge and use it to display something useful There, what needs to be done with the paths is manually set to the development or production paths.
--Steve