Map Widget is only displayed in Internet Explorer

Hello, I have some technical problems with the map widget and banner creation.

So I have created some map widgets with Internet Explorer, but they are not displayed on my site (www.verum-verba.de) neither in firefox, nor google chrome or safari browser. Also I can’t create a new map widget or banner in any of these three browsers in the Partner Centre. No error message comes up, but no result either and the loading indicator just loads and loads with no result….

What can I do so that users of all browsers get the map widget displayed???

The page I need help with: [log in to see the link]