IE11 window.showModalDialogue returns undefined if an object is set using window.returnValue

This is working on IE11 windows 2008R2.

I have built a windows 2012 R2 server with all the latest windows updates and I have proved that I can successfully pass back a string from the callee page loaded using window.showModalDialogue to the calling page. However an object can not  be returned. The calling page gets a returned value of undefined.

I have followed the advice on the following link:

https://support.microsoft.com/en-us/kb/3025390

I have downloaded the 2012 R2 fix 3025390. However I run this and get "The update is not applicable to your computer".

This is a nested modal dialogue - the parent is a modal dialogue as well.

It feels like the issue introduced with MS14-80 may have been re-introduced as I get the same symptoms under the same conditions.

Has anyone else experienced this ?

Is there a fix coming for this ?