Participant Status & ID error in adv.search builder

When using the Advanced Search Builder the options to search for 'Participant Status' do not work at all. Neither using the = operator, nor using IN.
On the other hand, the 'participant Status ID' does not allow to search on ID but offers a selection of participant statusses.
On several totally independent civicrm installations running 4.6.4 and drupal we get a fatal error when trying to search for 'Participant Status ID' using the operator IN. (Fatal error: is not of the type Int)
Drupal error log shows: Warning: trim() expects parameter 1 to be string, array given in CRM_Contact_BAO_Query::buildClause() (line 5219 of /home/ozk/domains/ourdomain.nl/public_html/prod/sites/all/modules/civicrm/CRM/Contact/BAO/Query.php).