Index: wp-admin/js/postbox.js
===================================================================
--- wp-admin/js/postbox.js	(revision 22266)
+++ wp-admin/js/postbox.js	(working copy)
@@ -10,7 +10,7 @@
 			$('.postbox h3, .postbox .handlediv').bind('click.postboxes', function() {
 				var p = $(this).parent('.postbox'), id = p.attr('id');
 
-				if ( 'dashboard_browser_nag' == id )
+				if ( 'dashboard_browser_nag' == id || $(this).parent().hasClass('was-sorted') )
 					return;
 
 				p.toggleClass('closed');
@@ -77,13 +77,19 @@
 				distance: 2,
 				tolerance: 'pointer',
 				forcePlaceholderSize: true,
-				helper: 'clone',
 				opacity: 0.65,
+				start: function (e,ui) {
+					$(ui.item[0]).addClass('was-sorted');
+				},
 				stop: function(e,ui) {
 					if ( $(this).find('#dashboard_browser_nag').is(':visible') && 'dashboard_browser_nag' != this.firstChild.id ) {
 						$(this).sortable('cancel');
 						return;
 					}
+					
+					setTimeout(function () {
+						$(ui.item[0]).removeClass('was-sorted');
+					}, 50);
 
 					postboxes.save_order(page);
 				},