Widget area in admin not working since update

Hi. I updated the Pinboard theme for my site youngentrepreneurssymposium.ca and now whenever I go to the widgets area when logged in as admin, if I click on anything on the screen – widgets, left side menu links – the window goes dark and a progress bar comes up but does nothing. The only way out is to close the tab in the browser and re-login.

Is there an easy fix?