Dałem tutaj cały kod pliku index, może Ty coś wynajdziesz. Zaznaczam też, ze problem powstał po zainstalowaniu pluginu na pokazywanie avatarów autorów ostatnich postów na stronie głównej. Odinstalowałem ten plugin i usunąłem z FTP i dalej to samo.
<html>
<head>
<title>{$mybb->settings['bbname']}</title>
{$headerinclude}
<script type="text/javascript">
<!--
lang.no_new_posts = "{$lang->no_new_posts}";
lang.click_mark_read = "{$lang->click_mark_read}";
// -->
</script>
</head>
<body>
{$header}
{$serversboard_index}
{$dvz_shoutbox}
{$bam_announcements}
<table border="0" width="100%" cellspacing="0" cellpadding="0" align="center">
<tr>
<td valign="top" style="padding-right: 20px" >
{$forums}
{$boardstats}
</td>
<td valign="top" width="300">
<table border="0" cellspacing="0" cellpadding="4" class="tborder">
<tr>
<td class="thead"><strong>Znajdź nas na Facebook'u</strong></td>
</tr>
<tr>
<td class="trow1"><div id="fb-root"></div>
<script>(function(d, s, id) {
var js, fjs = d.getElementsByTagName(s)[0];
if (d.getElementById(id)) return;
js = d.createElement(s); js.id = id;
js.src = "//connect.facebook.net/pl_PL/sdk.js#xfbml=1&version=v2.3&appId=557540287709457";
fjs.parentNode.insertBefore(js, fjs);
}(document, 'script', 'facebook-jssdk'));</script><div class="fb-page" data-href="https://www.facebook.com/pages/GRAMZESKILLEMpl/1600221393564164" data-width="290" data-height="500" data-hide-cover="false" data-show-facepile="true" data-show-posts="true"><div class="fb-xfbml-parse-ignore"><blockquote cite="https://www.facebook.com/pages/GRAMZESKILLEMpl/1600221393564164"><a href="https://www.facebook.com/pages/GRAMZESKILLEMpl/1600221393564164">GRAMZESKILLEM.pl</a></blockquote></div></div></td>
</tr>
</table><br />
{$teamonline}
{$steamgroup}
{$topStats['LastThreads']}
{$topStats['LastActiveThreads']}
{$topStats['MostViews']}
{$topStats['Posters']}
{$topStats['Reputation']}
{$topStats['Referrals']}
{$topStats['Timeonline']}
{$topStats['NewestUsers']}
</td>
</tr>
</table>
<dl class="forum_legend smalltext">
<dt><span class="forum_status forum_on" title="{$lang->new_posts}"></span></dt>
<dd>{$lang->new_posts}</dd>
<dt><span class="forum_status forum_off" title="{$lang->no_new_posts}"></span></dt>
<dd>{$lang->no_new_posts}</dd>
<dt><span class="forum_status forum_offlock" title="{$lang->forum_locked}"></span></dt>
<dd>{$lang->forum_locked}</dd>
<dt><span class="forum_status forum_offlink" title="{$lang->forum_redirect}"></span></dt>
<dd>{$lang->forum_redirect}</dd>
</dl>
<br class="clear" />
{$footer}
</body>
</html>