Link Save Inconsistent in IE 11

When using the link button and after pasting in a URL I have to click away from the link box to deselect it before clicking OK, otherwise the URL isn't saved. Instead it saves as [[label >> url:label]].

Workflow:
1.Select some text
2.Click the Link button from the tool bar. The Link dialog opens and the “Display Text” field is focused and the text I selected prior to clicking the Link button is selected
3.Select “URL type link” from Link field dropdown using mouse
4.Remove text from link field
5.Paste URL
6.Click OK
7.View page in source mode. Link appears as [[label >> url:label]]

A small variation of this workflow results in a "link not specified" error as described here: https://forum.xwiki.org/t/ckeditor-integration-v1-16-released/474/6?u=ben.megson