The server went down about 30 minutes ago, then came back about 15 minutes ago. Whenever I try to go to www.wordforge.net, Firefox asks if I want to open or download a PHP file. All the other URLs (new posts, members, etc.) work fine. Edit: If you're getting similar errors, try clearing your cache. It worked for me.
I just cleared my cache and it's all working fine now. O2C and Nick always suggest to do that first, so I figured I'd give it a shot