girolimoni
Finally got mine to work! Try adding the following to your .htaccess file... you may or may not have to remove the pound symbols
#<IfModule !mod_php5.c>
AddType x-mapp-php5 .php
AddHandler x-httpd-php5 .php
#</IfModule>
I saw the following error on Facebook Developers site... http://forum.developers.facebook.net/viewtopic.php?pid=168567
I too am suffering from the same issue. I've tried everything I know, but no luck here either. What host provider are you with?