WebView shows a black blank Page on Android

Hello,

i have made an xamarin.forms webview. The Content shows up corect on iOS. On Android the WebView shows a black blank Page. On Windows Phone it cames up with the error msg "Java Script is not enabled." but that's another story...

I'm very sure that my URL (http://panorama.cityguide.com/stadt-wien_1192/pano.html) work's on Android in the past. Unfortunately i dont know on which Version. So many updates... ;-)

Can anyone help?

Here my Code:

<ContentPage xmlns="http://xamarin.com/schemas/2014/forms"
             xmlns:x="http://schemas.microsoft.com/winfx/2009/xaml"
             x:Class="Pages.ContentBagePoiPano" Title="Pano">
  <WebView Source="http://panorama.cityguide.com/stadt-wien_1192/pano.html"></WebView>
</ContentPage>