These changes allow you to assign a new bug.
At line 90, find
PHP Code:
print_select_row($vbphrase['vbug_assigned_to'], 'adminid', array('0' => $vbphrase['vbug_unassigned'], $users['userid'] => $users['username']));
and change to
PHP Code:
makeassignmentchooser($vbphrase['vbug_assigned_to'], 'adminid', 'user', 'userid', 'username', 'username', "WHERE usergroupid IN($userarray[vbuggroupids]) OR FIND_IN_SET('$userarray[vbuggroupids]', membergroupids)", iif($bug['adminid'], $bug['adminid'], -1), $vbphrase['vbug_unassigned']);