Index: wp-admin/js/postbox.js
===================================================================
--- wp-admin/js/postbox.js	(revision 22266)
+++ wp-admin/js/postbox.js	(working copy)
@@ -77,13 +77,14 @@
 				distance: 2,
 				tolerance: 'pointer',
 				forcePlaceholderSize: true,
-				helper: 'clone',
 				opacity: 0.65,
 				stop: function(e,ui) {
 					if ( $(this).find('#dashboard_browser_nag').is(':visible') && 'dashboard_browser_nag' != this.firstChild.id ) {
 						$(this).sortable('cancel');
 						return;
 					}
+					
+					$(ui.item[0]).toggleClass('closed');
 
 					postboxes.save_order(page);
 				},