This is a known problem with WordPress 3.5 in combination with some plugins. The plugins aren’t yet updated for the latest WordPress version. When you have those plugins installed they display an error which causes all the javascript not to work anymore. Other users had problems with Gravatar and Statcounter. If you have those activated first try to deactivate those and see if the menu and menucard start working again.

If you still have problems let me know and we’ll figure it out 🙂