Hi. Thanks for the fast response. I'm trying to think of all the components, modules, plugins I installed. (AcyMailing, JEvents and WidgetKit which is part of the Katana template I'm using from YooTheme)
It had been working fine, and then I went into add an image to an event and the editor didn't load, and the CodeMirror compatibility message started displaying. I did install the JCE editor, to see if I could switch to that as the default editor in Global Config. But it has no effect. No matter what editor I use, it does not load anywhere in the front-end or back-end of the site. I also tried logging out and back in again, no effect. I don't see where the button is within an event to turn off the WYSIWYG editor. Can I provide you with a login so you can take a look?