If PATH_INFO contains the index, don't use it for permalinks. Props gslin. fixes #1591

git-svn-id: http://svn.automattic.com/wordpress/trunk@2852 1a063a9b-81f0-0310-95a4-ce76da25c4cd

wp-includes/classes.php

@@ -1365,7 +1365,7 @@ class WP {
 
 				// The requested permalink is in $pathinfo for path info requests and
 				//  $req_uri for other requests.
-				if (! empty($pathinfo)) {
+				if (! empty($pathinfo) && ($wp_rewrite->index != $pathinfo)) {
 					$request = $pathinfo;
 				} else {
 					$request = $req_uri;