Cannot Edit Galleries with Updated Version

I just updated to 3.6 and cannot get to “Edit Gallery”
My site http://humantraffickingawareness.org/ has several pages with Galleries. Before the update, when I would go to edit those pages, you could see a huge place holder for the gallery… click on it… then see an edit gallery button. Since the update, those pages are empty when I go to edit them, and I cannot open the existing gallery to edit or add photos.

How can I edit galleries in 3.6?? or how can I go back to the previous version??