Index: wp-includes/js/autosave.dev.js
===================================================================
--- wp-includes/js/autosave.dev.js	(revision 1775)
+++ wp-includes/js/autosave.dev.js	(working copy)
@@ -114,10 +114,11 @@
 			if ( !isNaN(postID) && postID > 0 ) {
 				autosave_update_slug(postID);
 			}
+			// Only Show messages if there is no error that needs to stay on the page
+			if ( message ) { jQuery('#autosave').html(message); } // update autosave message
+			else if ( autosaveOldMessage && res ) { jQuery('#autosave').html( autosaveOldMessage ); }
 		}
 	}
-	if ( message ) { jQuery('#autosave').html(message); } // update autosave message
-	else if ( autosaveOldMessage && res ) { jQuery('#autosave').html( autosaveOldMessage ); }
 	return res;
 }