assignment type (advanced) upload, in file assignment.class.php, in function setup_elements() the default value for 'trackdrafts' is not set correctly.

Near line 1053:
$mform->addElement('select', 'var4', get_string("trackdrafts", "assignment"), $ynoptions);
$mform->setHelpButton('var4', array('trackdrafts', get_string('trackdrafts', 'assignment'), 'assignment'));
$mform->setDefault('trackdrafts', 1);

The last line should be
$mform->setDefault('var4', 1);

The form's variable name is var4 - not trackdrafts.