[BBR-APBT]

This looks more correct to me:

if ($_REQUEST['do'] == 'ignoredthreadslist')
{
    construct_usercp_nav('ignoredthreadslist');
    $navbits[''] = $vbphrase['ignored_threads_list'];
    $templater = vB_Template::create('usercp_ignoredthreadslist');
    $templater->register_page_templates();
    $templater->register('templatevar',$templatevar);
    $templatename = $templater->render();
}

if ($_REQUEST['do'] == 'ignorethread' || $_REQUEST['do'] == 'unignorethread')
{
  $templater = vB_Template::create('bogus');
  $templater->register_page_templates();
  $templater->register('templatevar',$templatevar);
  $templatename = $templater->render();
}