Unable to add images to posts and see visual editor after 3.5 upgrade

I (as well as my site’s 11 other authors) am unable to add images to my posts, as well as use the visual editor since the 3.5 upgrade. I have cleared my cache, deactivated all plugins and tried temporarily switching to the twenty eleven and twenty twelve themes. my site is http://www.sozowomen.com

None of this has fixed the problem.

Help is appreciated. Thanks!

http://wordpress.org/extend/plugins/wordpress/