bobbo314

Change line 9 of pfs-submit.php to read:
ini_set('display_errors',0);

I had the same problem and found that it was because PHP errors were displayed. When parseJSON() was called on line 27 of pfs-script.js it was printing HTML along with the JSON string which parseJSON cannot parse. The author must have used lines 8 & 9 on pfs-submit.php to debug.

I display the success message similar to how error messages are displayed by changing the complete function in pfs-script.js to read:

complete: function(request,textStatus,error) {
                data = jQuery.parseJSON(request.responseText);
                if (data && data.error) {
                	//alert(data);
                    jQuery('#pfs-alert').addClass('error').html('<p>'+data.error+'</p>').show();
                    jQuery('.pfs-post-form #post').val('Post');
                } else {
		jQuery('form.pfs').reset();
                    jQuery('#pfs-alert').addClass('success').html('<p>'+data.success+'</p>').show();
                    jQuery('.pfs-post-form #post').val('Post');
                }

		jQuery('html, body').animate({ scrollTop: 0 }, 500);

            }