Drop-down menu won't work

I have a site that I built on a throwaway domain on the Matheson Pro theme. When I transferred everything to the new domain, imfi.us, the drop-down menu stopped working. I imported the theme settings and the content and re-added all media by hand.

I uninstalled and reinstalled the them completely and the problem persisted. I also have the same plugins installed and running that I had before I moved everything over to the new domain.

Help?