[Colin F]

Hmmm.... try this (untested):

in your showthread.php file, find:

PHP Code:

if ($bbuserinfo['postorder'] == 0)
{
    $postorder = '';
}
else
{
    $postorder = 'DESC';
} 


replace that with:

PHP Code:

if ($threadid == 'xx')
{
    $postorder = '';
}
else
{
if ($bbuserinfo['postorder'] == 0)
{
    $postorder = '';
}
else
{
    $postorder = 'DESC';
}
} 


replace xx with the threadid of the thread you want this to happen to.