Did the column sorting function change in 3.5?

[Oreamnos]

My column sorting arrows used to appear with 307 but now after i click the default sorted column arrow, no more arrows appear, therefore now i can only sort DESC but not ASC.

here is my code:

PHP Code:

// ########################################################
// handle sorting
// ########################################################
$vbulletin->input->clean_array_gpc('r', array(
 'sortfield'   => TYPE_STR,
 'sortorder' => TYPE_STR,
 'sort'  => TYPE_STR,
));


// look at sorting options:
if ($vbulletin->GPC['sortorder'] != 'asc')
{
    $sqlsortorder = 'DESC';
    $order = array('desc' => HTML_SELECTED);
}
else
{
    $sqlsortorder = '';
    $order = array('asc' => HTML_SELECTED);
}


switch ($vbulletin->GPC['sortfield'])
{
    case 'bar_name':
        $sqlsortfield = 'bar_name';
        break;
    case 'bar_update_time':
        $sqlsortfield = 'bar_update_time';
        break;
    case 'bar_viewcount':
        $sqlsortfield = 'bar_viewcount';
        break;
    default:
        $sqlsortfield = 'bar_update_time';
        $sortfield = 'bar_update_time';
}
$sort = array($sortfield => HTML_SELECTED);
$oppositesort = iif($sortorder == 'asc', 'desc', 'asc');

$sorturl = "/cities.php?p=" . $vbulletin->GPC['p'];
eval('$sortarrow[' . $sortfield . '] = "' . fetch_template('forumdisplay_sortarrow') . '";'); 


Template:

               <td align="left" class="thead">
                    <span style="white-space:nowrap"><a href="$sorturl&amp;order=desc&amp;sort=bar_name">Bar Name</a> $sortarrow[bar_name]</span>/Description
                </td>
                <td align="center" class="thead">
                    <span style="white-space:nowrap"><a href="$sorturl&amp;order=desc&amp;sort=bar_update_time">Updated</a> $sortarrow[bar_update_time]</span>
                </td>
                <td align="left" class="thead">
                    <span style="white-space:nowrap"><a href="$sorturl&amp;order=desc&amp;sort=bar_viewcount">$vbphrase[views]</a> $sortarrow[bar_viewcount]</span>
                </td>

do i need to change something for 3.5?

thanks
eric