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1. Create a profile with some fields.
2. Note the profile?s gid.
3. Go to http://drupal/civicrm/profile?reset=1&gid=3 (changing the gid accordingly) ? there?s nothing between ?Find Contacts? and CiviCRM?s footer (i.e., the search form is missing).
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I double-checked, and all the fields are fully visible (and are to appear in the selector). I reproduced it on our PHP5 sandbox (note: the demo privileges are not enough to see this): http://sandbox.openngo.org/civicrm/drupal-php5/civicrm/profile?reset=1&gid=3
so you also need to set "is_searchable" for a field to appear in the search box 
This was a frequent user request since their selector might be way more than what they want people to search on
D?oh! I?m sorry. Guess I should?ve kept an eye on the non-CiviMail development more closely.
Tested and it works as advertised (still no ?groups? column in the selector, but IIRC that?s a ?feature?). Closing.
This is most likely because no field had any searchable option set etc or the Public User Pages and Listings flag set