Detailed Description:
With newest versions of Jquery I had to update your admin_reorder_hierarchy.tpl
file with :
line 6:
if(subtree.length > 0)
line 28;
$('#submit_btn').on('click',function(){
var tree = JSON.stringify(parseTree($('ul.sortable')));
$('#orderdata').val(tree);
});
Now it works back again on my 2.3-beta7 - Thanks