In the app settings, under Page Tab, enter the URL to the facebook app files hosted on your site rather than the facebook app link itself and it will work.
I.e. if you uploaded your php files to mysite.com/app, link to that rather than apps.facebook.com/myapp
The only problem I'm seeing now is that the app is wider than the space provided on the facebook page itself, but when you click on any link, it goes to a new window so it's definitely better than nothing