+--- eventum-2.3.1/lib/eventum/class.search.php~ 2011-04-20 17:22:15.000000000 +0300
++++ eventum-2.3.1/lib/eventum/class.search.php 2011-04-20 17:44:34.498519260 +0300
+@@ -63,6 +63,12 @@
+ {
+ $sort_by = self::getParam('sort_by');
+ $sort_order = self::getParam('sort_order');
++ $users = self::getParam('users');
++ if (empty($users) && $sort_by === 'isu_order') {
++ // Sorting by isu_order is impossible when no user specified
++ unset($sort_by);
++ unset($sort_order);
++ }
+ $rows = self::getParam('rows');
+ $hide_closed = self::getParam('hide_closed');
+ if ($hide_closed === '') {
+@@ -174,6 +174,7 @@
+ "iss_expected_resolution_date" => "desc",
+ "pre_title" => "asc",
+ "assigned" => "asc",
++ "isu_order" => "desc",
+ );
+
+ foreach ($custom_fields as $fld_id => $fld_name) {