From the Webmaster:
Suddenly I noticed that the top menu bar was empty. I wasn't sure what happened so I went into the admin panel to check the menu - which is empty. It appears all of the menus items have vanished, and I have no idea why. I am hoping that it is something to do with the server upgrade, but I will try to find out. In the meantime, if you need a link to a specific article, please let me know, I can look it up in the admin panel.
Sorry for the inconvience
UPATED: Just found out it is because the server has been upgraded and is now running PHP 5.3. I'm looking into a way to fix the problem. Thank you for your patience.