[FullyTested]

Once again, insure the code is inside the curly brackets:

PHP Code:

    switch ($_REQUEST['do'])
    {
        case 'movethread':   $navbits[''] = $vbphrase['move_thread']; break;
        case 'copythread':    $navbits[''] = $vbphrase['copy_thread']; break;
        case 'editthread':   $navbits[''] = $vbphrase['edit_thread']; break;
        case 'deletethread': $navbits[''] = $vbphrase['delete_thread']; break;
        case 'deleteposts':  $navbits[''] = $vbphrase['delete_posts']; break;
        case 'mergethread':  $navbits[''] = $vbphrase['merge_threads']; break;
    // start code 'ban from thread'
        case 'banuserthread': $navbits[''] = $vbphrase['ban_from_thread']; break;
        case 'liftbanthread': $navbits[''] = $vbphrase['lift_threadban']; break;
        case 'banthreadinfo': $navbits[''] = $vbphrase['banthread_info']; break;
    // end code 'ban from thread'
    }