Thread:Extension talk:WYSIWYG/IE11 with MW 1.22.0 + WYSIWYG extension: Existing category definitions will corrupt after after page has been saved/reply (7)

To be clear, no problems in IE8 nor IE11?

AFAIK, IE has a feature to see webpages as if they were viewed using a previous version (IE10, IE9). Such tests would be useful (if you can), although I actually don't care much of supporting legacy browsers.