Index: wp-includes/functions.php
===================================================================
--- wp-includes/functions.php	(revision 18057)
+++ wp-includes/functions.php	(working copy)
@@ -2038,7 +2038,8 @@
 }
 
 /**
- * Retrieve referer from '_wp_http_referer', HTTP referer, or current page respectively.
+ * Retrieve referer from '_wp_http_referer' or HTTP referer. If it's the same
+ * as the current request URL, will return false.
  *
  * @package WordPress
  * @subpackage Security
@@ -2047,13 +2048,13 @@
  * @return string|bool False on failure. Referer URL on success.
  */
 function wp_get_referer() {
-	$ref = '';
+	$ref = false;
 	if ( ! empty( $_REQUEST['_wp_http_referer'] ) )
 		$ref = $_REQUEST['_wp_http_referer'];
 	else if ( ! empty( $_SERVER['HTTP_REFERER'] ) )
 		$ref = $_SERVER['HTTP_REFERER'];
 
-	if ( $ref !== $_SERVER['REQUEST_URI'] )
+	if ( $ref && $ref !== $_SERVER['REQUEST_URI'] )
 		return $ref;
 	return false;
 }
Index: wp-admin/post.php
===================================================================
--- wp-admin/post.php	(revision 18057)
+++ wp-admin/post.php	(working copy)
@@ -94,7 +94,9 @@
 	$action = 'preview';
 
 $sendback = wp_get_referer();
-if ( strpos($sendback, 'post.php') !== false || strpos($sendback, 'post-new.php') !== false ) {
+if ( !$sendback ||
+     strpos($sendback, 'post.php') !== false ||
+     strpos($sendback, 'post-new.php') !== false ) {
 	$sendback = admin_url('edit.php');
 	$sendback .= ( !empty( $post_type ) ) ? '?post_type=' . $post_type : '';
 } else {
Index: wp-admin/edit.php
===================================================================
--- wp-admin/edit.php	(revision 18057)
+++ wp-admin/edit.php	(working copy)
@@ -51,6 +51,8 @@
 	check_admin_referer('bulk-posts');
 
 	$sendback = remove_query_arg( array('trashed', 'untrashed', 'deleted', 'ids'), wp_get_referer() );
+	if ( !$sendback )
+		$sendback = admin_url($parent_file);
 	$sendback = add_query_arg( 'paged', $pagenum, $sendback );
 	if ( strpos($sendback, 'post.php') !== false )
 		$sendback = admin_url($post_new_file);