I've recently upgraded a site for the Add Media button wasn't working. Now, having upgraded to 4.2.2 the Add Media works, but the Wysiwyg editor isn't showing.
The only console messages I'm receiving are:
Uncaught ReferenceError: edButtons is not defined (anonymous function) @ post-new.php:131
The new post screen appears with the Text tab selected, instead of Visual, and when I try to select the Visual tab I get:
Uncaught TypeError: Cannot read property 'canvas' of undefined a.closeAllTags @ quicktags.min.js?ver=4.2.2:1 window.switchEditors.go @ editor.min.js?ver=4.2.2:1 window.switchEditors.switchto @ editor.min.js?ver=4.2.2:1 onclick @ post-new.php:405