Index: domain_conf.admin.inc
===================================================================
RCS file: /cvs/drupal-contrib/contributions/modules/domain/domain_conf/domain_conf.admin.inc,v
retrieving revision 1.8
diff -u -r1.8 domain_conf.admin.inc
--- domain_conf.admin.inc	25 Mar 2009 20:02:31 -0000	1.8
+++ domain_conf.admin.inc	26 Mar 2009 17:42:16 -0000
@@ -59,6 +59,9 @@
     }
     if ($action['#form']['#type'] == 'select') {
       $action['#form']['#options'] = array_merge(array(NULL => t('Use primary domain settings')), $action['#form']['#options']);
+      if (!isset($action['#form']['#default_value'])) {
+      	$action['#form']['#default_value'] = array(NULL => t('Use primary domain settings'));
+      }
     }
     $group = isset($action['#group']) ? $action['#group'] : $default_group;
     if (!isset($form[$group])) {