I updated to the 4.6.3 version of CiviCRM for Wordpress, and discovered that I'm not able to bring up a listing/search page via the 'Use Profile-Listings Mode' - I get taken to a page on the front-end of WordPress with a message 'No fields in this Profile have been configured as searchable. Ask the site administrator to check the Profile setup.'
The listings/search option seems to work fine in the Drupal installation I usually use, which is on 4.6.2, but the problem does seem to happen in both the Wordpress and Drupal demo versions of CiviCRM 4.6.4.
As far as I'm aware there's only two places to set searchability - on the field itself, and in the Profile fields edit list. In 4.6.2, I get the error message if I forget to set the Profile fields as searchable, but when I edit them to be searchable, the search listing works fine - as far as I can tell, I've not done anything different when trying it in 4.6.3.