When you specify a crompression preset in the config file, e.g.
$cfg['Export'] = array (
'format' => 'sql',
'compression' => 'bzip2',
'asfile' => true
);
instead of the selected compression "none" is used on the export page. The compression has to changed by hand to get a bzip2 file instead of an uncompressed sql file.
Tryed with the lastest release 3.4.1 on ubuntu 10.04 LTS and apache 2.2.14
This bug was fixed in repository and will be part of a future release; thanks for reporting.