by Chris Jacobs.
At util/helper/convert_helper.class.php:136:
// CJ - fix attempt
// $dirpath = $CFG->tempdir . '/backup/' . $tempdir; //orig
$dirpath = $CFG->tempdir . '/backup/'; //new
That seemed to work, but I can't confirm. The $tempdir appears to be bunk. Someone please verify or repudiate. Thanks.