Index: wp-admin/includes/post.php
===================================================================
--- wp-admin/includes/post.php	(revision 13024)
+++ wp-admin/includes/post.php	(working copy)
@@ -335,7 +335,7 @@
  * @return object stdClass object containing all the default post data as attributes
  */
 function get_default_post_to_edit( $post_type = 'post', $create_in_db = false ) {
-	global $wpdb;
+	global $wpdb, $user_ID;
 
 	$post_title = '';
 	if ( !empty( $_REQUEST['post_title'] ) )
@@ -349,12 +349,19 @@
 	if ( !empty( $_REQUEST['excerpt'] ) )
 		$post_excerpt = esc_html( stripslashes( $_REQUEST['excerpt'] ));
 
-	if ( $create_in_db ) {
+	if ( $create_in_db && $user_ID ) {
 		// Cleanup old auto-drafts more than 7 days old
 		$old_posts = $wpdb->get_col( "SELECT ID FROM $wpdb->posts WHERE post_status = 'auto-draft' AND DATE_SUB( NOW(), INTERVAL 7 DAY ) > post_date" );
-		foreach ( (array) $old_posts as $delete )
+		foreach ( (array) $old_posts as $delete ) {
 			wp_delete_post( $delete, true ); // Force delete
-		$post = get_post( wp_insert_post( array( 'post_title' => __( 'Auto Draft' ), 'post_type' => $post_type, 'post_status' => 'auto-draft' ) ) );
+		}
+
+		$auto_draft_id = $wpdb->get_var( $wpdb->prepare( "SELECT ID FROM $wpdb->posts WHERE post_status = 'auto-draft' AND post_author = %d", $user_ID ) );
+
+		if ( empty($auto_draft_id) )
+			$auto_draft_id = wp_insert_post( array( 'post_title' => __( 'Auto Draft' ), 'post_type' => $post_type, 'post_status' => 'auto-draft', 'post_author' => $user_ID ) );
+
+		$post = get_post( $auto_draft_id );
 	} else {
 		$post->ID = 0;
 		$post->post_author = '';