Index: wp-admin/js/nav-menu.dev.js
===================================================================
--- wp-admin/js/nav-menu.dev.js	(revision 14438)
+++ wp-admin/js/nav-menu.dev.js	(working copy)
@@ -349,7 +349,7 @@
 					// Set us to be the ajax target
 					targetList = target.children('.menu-item-transport');
 					// Get all checked elements and assemble selected items.
-					items = menuItems.filter('.selected-menu-item').children().not( ui.helper ).clone();
+					items = li.parents('.tabs-panel').find('.selected-menu-item').children().not( ui.helper ).clone();
 					ui.helper.children('.additional-menu-items').append( items );
 					// This class tells the sortables to treat it as a new item.
 					ui.helper.addClass('new-menu-item');
@@ -372,7 +372,7 @@
 				stop: function(e, ui) {
 					// Reset the targetList and unselect the menu items
 					targetList = menuList;
-					menuItems.filter('.selected-menu-item').deselectItem();
+					$(e.target).parents('.tabs-panel').find('.selected-menu-item').deselectItem();
 				}
 			});
 		},