I have a Facebook app built on WP. It was displaying fine for months and when I went to update the app yesterday, I noticed the app was no longer displaying in Facebook. It's fine outside of Facebook. Not sure how long it's been down. I tested a static HTML file and wrote a PHP script outside of WP that uses multiple files to build the page and it displayed fine. This makes me think it's a WP issue with Facebook. Has anyone else had an issue like this and/or know anything that I can do to get this thing up and running again?