If i click on the header of order column, the view switch from "Documents" to "Orders" and the list is empty (for the moment i have only free documents)!
I notice that this issue is for each menu of backend (categories, files, documents etc.).
This is the source html of the page:
<div id="editcell">
<table class="adminlist">
<thead>
<tr>
<th width="5">
NUM </th>
<th width="20">
<input type="checkbox" name="toggle" value="" onclick="checkAll(20);" />
</th>
<th style="text-align: left;">
<a href="#" onclick="Joomla.tableOrdering('a.title','asc','');" title="Clicca per ordinare per questa colonna">Title</a> </th>
<th style="text-align: left;">
<a href="#" onclick="Joomla.tableOrdering('b.name','asc','');" title="Clicca per ordinare per questa colonna">Category</a> </th>
<th style="text-align: left;">
<a href="#" onclick="Joomla.tableOrdering('a.filename','asc','');" title="Clicca per ordinare per questa colonna">File</a> </th>
<th>
<a href="#" onclick="Joomla.tableOrdering('a.price','asc','');" title="Clicca per ordinare per questa colonna">Price</a> </th>
<th>
<a href="#" onclick="Joomla.tableOrdering('sales','asc','');" title="Clicca per ordinare per questa colonna">#Sales</a> </th>
<th class="title">
<a href="#" onclick="Joomla.tableOrdering('a.hits','asc','');" title="Clicca per ordinare per questa colonna">Hits</a> </th>
<th class="title">
<a href="#" onclick="Joomla.tableOrdering('a.published','asc','');" title="Clicca per ordinare per questa colonna">Published</a> </th>
<th width="8%" nowrap="nowrap">
<a href="#" onclick="Joomla.tableOrdering('a.ordering','asc','');" title="Clicca per ordinare per questa colonna">Order</a> <a href="javascript:saveorder(19, 'save_document_order')" class="saveorder" title="Salva ordine"></a> </th>
<th width="1%" nowrap="nowrap">
<a href="#" onclick="Joomla.tableOrdering('a.id','desc','');" title="Clicca per ordinare per questa colonna">ID<img src="/media/system/images/sort_asc.png" alt="" /></a> </th>
</tr>
</thead>
<tfoot>