Index: wp-includes/functions-post.php
===================================================================
--- wp-includes/functions-post.php	(revision 2980)
+++ wp-includes/functions-post.php	(working copy)
@@ -35,6 +35,8 @@
 	}
 	$post_cat = $post_category[0];
 
+	$post_author = $post_author_override;
+
 	if ( empty($post_author) )
 		$post_author = $user_ID;