Index: src/wp-admin/js/edit-comments.js
===================================================================
--- src/wp-admin/js/edit-comments.js	(revision 31632)
+++ src/wp-admin/js/edit-comments.js	(working copy)
@@ -603,7 +603,9 @@
 					disableInInput: true,
 					type: 'keypress',
 					noDisable: '.check-column input[type="checkbox"]'
-				}
+				},
+				cycle_expr: '#the-comment-list tr',
+				start_row_index: 0
 			}
 		);
 	}