I've uploaded the latest CKEditor into the latest version of Zen Cart.
It works great in Firefox, Chrome, etc.
But when attempting to use the editor in IE 10, much of the editor is non-functional.
Compared to viewing the same page in Chrome, most of the icons in IE appear very pale instead of with the black text. Some of them are non-functional, such as 'paste', 'bold', 'italics'. When I try the "hyperlink" option, I get only part of the dialog box (title, OK, Cancel) but nothing in the box to create a link, and it is impossible to dismiss the box -- have to reload the page to get control back. Same thing happens with "Insert image".
Also, the Developers console shows Javascript errors like the following:
SCRIPT5007: Unable to get property 'specified' of undefined or null reference
ckeditor.js, line 77 character 458
SCRIPT5007: Unable to get property 'specified' of undefined or null reference
ckeditor.js, line 77 character 458
SCRIPT5007: Unable to get property 'specified' of undefined or null reference
ckeditor.js, line 77 character 458