It appears some third party software was causing the issue you were seeing. I've renamed your index.php file to index-broken.php and replaced it with a working one. You should contact the developer to follow up on this. In the future, you will recieve the quickest responses by going to our help center directly at http://help.ning.com/. Thanks!
Hi Eric, if you could click on the "Contact Us" link in the Help Center at http://help.ning.com that would be awesome - you should also say that your network has an "Our Apologies" error on the front page.
I would love to help personally but I'm a bit swamped with everything going on right now. My apologies for that.