Index: modules/views/views_query.inc
===================================================================
--- modules/views/views_query.inc	(revision 404)
+++ modules/views/views_query.inc	(working copy)
@@ -105,12 +105,13 @@
     }
     else if (is_array($filter['value'])) {
       if ($filter['operator'] == 'OR' || $filter['operator'] == 'NOR') {
-        $not = '';
-        if ($filter['operator'] == 'NOR') {
-          $not = "NOT";
-        }
         $query->ensure_table($table);
-        $query->add_where("$table.$field $not IN ('" . implode("','", $filter['value']) . "')");
+		if ($filter['operator'] == 'OR') {
+		  $query->add_where("$table.$field IN ('" . implode("','", $filter['value']) . "')");
+		}
+		else {
+		  $query->add_where("$table.$field NOT IN ('" . implode("','", $filter['value']) . "') OR $table.$field IS NULL");		  
+		}
       }
       else {
         $howmany = count($filter['value']);