function DBselect has a line such as this:

$query = 'SELECT * FROM ('.$query.') WHERE rownum BETWEEN '.intval($offset).' AND '.intval($till);

This is supposed to be imitating LIMIT, but could return no rows when lower bound is > 1.

http://www.oracle.com/technetwork/issue-archive/2006/06-sep/o56asktom-086197.html