Prueba denuevo: <tr>
<td class="{$bgcolor}" align="center" valign="top" width="1"><img src="{$theme['imgdir']}/{$lightbulb['folder']}.gif" alt="{$lightbulb['altonoff']}" title="{$lightbulb['altonoff']}" class="ajax_mark_read" id="mark_read_{$forum['fid']}" /></td>
<td class="{$bgcolor}" valign="top">
<strong><a href="{$forum_url}">{$forum['name']}</a></strong>{$forum_viewers_text}<div class="smalltext">{$forum['description']}{$modlist}{$subforums}</div>
</td>
<td class="{$bgcolor}" width="85" valign="top" align="center" style="white-space: nowrap">{$threads}{$unapproved['unapproved_threads']}<br /> {$lang->forumbit_threads}</td>
<td class="{$bgcolor}" width="85" valign="top" align="center" style="white-space: nowrap">{$posts}{$unapproved['unapproved_posts']}<br /> {$lang->forumbit_posts}</td>
<td class="{$bgcolor}" width="200" valign="top" align="right" style="white-space: nowrap">{$lastpost}</td>
</tr>
Lo habrás copiado mál, pues, desinstala el plugin de comentarios y luego instalalo denuevo