Insert element broken on IE11

Hi, Can anyone help?

I have a page with 3 editor instances and save which one last had focus.

I am then inserting some widget HTML from a click on a page element outside of the editor and HTML gets inserted at last cursor position of editor with focus. (using jquery onclick) 

Code as follows...

var editor = CKEDITOR.instances[targetEditorID];
var element = CKEDITOR.dom.element.createFromHtml(html, editor.document);
editor.insertElement(element);
editor.widgets.initOn(element, tagname);

Works perfectly on Chrome, FF but strange behaviou on IE11 - sometime works, sometimes inserts nothing but loses cursor, sometimes inserts at beginning of doc - also double click sometimes works better...

Any thoughts?