ckgedit 4.3 and IE 11
If you are using IE 11 or later, then you must use a version of ckgedit which is based on a version of the CKEditor that is 4.3 or later. This version of ckgedit also updates the file browser to accommodate changes in the way in which IE identifies itself. You can download this version of ckgedit from github.
CKEDitor has now been upgraded from 4.4. to 4.7
CKEDitor has now been upgraded from 4.4.7 to 4.5.1