title: jquery fullcalendar: JSON data not loading in any browser except FF3
body: <p>I've got a fullcalendar set up on the following url: <a href="http://www.forumtheatrebillingham.co.uk/show-calendar.html" rel="nofollow">http://www.forumtheatrebillingham.co.uk/show-calendar.html</a></p>
  
  <p>It had been working fine, but now something has gone wrong and the data returned by my JSON feed isn't being displayed in the calendar in any browser except FF3.</p>
  
  <p>There are no javascript errors being displayed and monitoring the ajax requests in a console shows them being correctly fetched when the next/last month buttons are pressed.</p>
  
  <p>I'm at a loss to explain why it's not working, can anyone suggest anything?</p>