Index: branches/5.1.x/admin_templates/products/products_edit.tpl
===================================================================
diff -u -N -r13100 -r13458
--- branches/5.1.x/admin_templates/products/products_edit.tpl	(.../products_edit.tpl)	(revision 13100)
+++ branches/5.1.x/admin_templates/products/products_edit.tpl	(.../products_edit.tpl)	(revision 13458)
@@ -161,11 +161,13 @@
 </div>
 
 <script language="javascript" type="text/javascript">
+	$(document).ready(reflect_filename);
+	disable_categories('<inp2:p_InputName name="CategoryId"/>', <inp2:p_AllowedCategoriesJSON/>);
+
 	function reflect_filename() {
     	var $checked = document.getElementById('_cb_<inp2:p_InputName field="AutomaticFilename"/>').checked;
     	document.getElementById('<inp2:p_InputName field="Filename"/>').readOnly = $checked;
     }
-	reflect_filename();
 
 	function openShipping() {
 		openSelector('p','<inp2:m_link t="in-commerce/products/shipping_options" pass="all"/>', 'ShippingOption', '800x600', 'OnPreSaveAndOpenPopup');