I'm pretty sure it's this bit of code in templates/default/activetopics.tpl
Find:
<div {$topics[row].tool_tip}>
{if $topics[row].gonew}
<a href="{ubb url="ubb=show`$display`&topic=`$topics[row].topic_id`&gonew=1#UNREAD"}"><img src="{$config.BASE_URL}/images/{$style_array.general}/gotonew.gif" alt="{$lang.JUMP_NEW}" title="{$lang.JUMP_NEW}" /></a>
{/if}
<a href="{ubb url="ubb=show`$display`&Number=`$topics[row].post_id`#Post`$topics[row].post_id`" title=$topics[row].post_subject}">{$topics[row].post_subject}</a>
{$lang.TEXT_BY} {$topics[row].poster_name}
@ {$topics[row].post_time}<br />
</div>
Not 100% sure offhand on what to replace the if statement with right this second (as I'm out right now)