Since the upgrade of wordpress 3.5. The editor is not working properly, basically switching from text to visual...or viceversa. the buttons just don't expand...
If this may help at all...the error console on my safari says:
load-scripts.php:2TypeError: 'undefined' is not an object (evaluating 'e.length')
post.php:264TypeError: 'undefined' is not an object (evaluating 'switchEditors.switchto')
