diff -Naur ori/wp-includes/post.php new/wp-includes/post.php
--- ori/wp-includes/post.php	2008-12-26 02:57:36.000000000 +0100
+++ new/wp-includes/post.php	2009-02-28 14:14:30.000000000 +0100
@@ -1460,6 +1460,7 @@
 	$data = compact( array( 'post_author', 'post_date', 'post_date_gmt', 'post_content', 'post_content_filtered', 'post_title', 'post_excerpt', 'post_status', 'post_type', 'comment_status', 'ping_status', 'post_password', 'post_name', 'to_ping', 'pinged', 'post_modified', 'post_modified_gmt', 'post_parent', 'menu_order', 'guid' ) );
 	$data = apply_filters('wp_insert_post_data', $data, $postarr);
 	$data = stripslashes_deep( $data );
+	extract( $data, EXTR_OVERWRITE );
 	$where = array( 'ID' => $post_ID );
 
 	if ($update) {