Search Builder doesn't provide options, Select Fields for export has no field list

This is on 1.5.6892 Drupal PHP4

Two places where the user doesn't have the abilty to build the search query:

1) On the search builder (eg: civicrm/contact/search/builder?reset=1)
No fields list in either box

2) On exporting a search and choosing to select fileds (civicrm/contact/search/basic?_qf_Map_display=true)
No fields listed in export box.

Thanks so much for working on this- this software has been a life saver for the organization I'm working on this for.