WP Page Widget v. 3.5 Customization Problem

I just noticed that I cannot edit my customize WP Page Widget available to drag and drop to the main sidebar. I have no ability to drag and make changes from the available widgets on the left to the main sidebar on the right when I’m on the edit page. I cannot even open the drop down menu widgets on the main sidebar. Please Help. Thank you.

The page I need help with: [log in to see the link]