Website not working in IE11. How to solve?

Please some help/advice on solving a website not showing/working in IE11, using version 2.7.1.

I have a website: www.leuker.nl that works in browsers like FF and Chrome, but not in IE11. 

With the IE dev tools (F12) I see it's loading, and the GWT JS app is starting as it's doing backend calls to Tomcat and is loading splitpoint js files.

However, the app is not showing and no error is shown :(

What suppose to happen is: The "Loading ...." text is removed as Element.removeFromParent() as soon as the app is loaded. The the Element with id "IdContainer" is searched through DOM.getElementById() and filled. If the Element isn't found, an error popup is shown.

I tried the IE meta tag: 

 <meta http-equiv="X-UA-Compatible" content="IE=10">

but no luck. 

I noticed that the gecko permutation is used (style set on the html tag), and know the permutation issues discussed in #8228, but I am a bit lost.

Please some advice solving/debugging it?

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