Server problems with WordPress SEO

Hello,

I got this message from my web host regarding WordPress SEO:

==============================
$content = $wpseo_admin_pages->checkbox( 'enablexmlsitemap', __( 'Check this box to enable XML sitemap functionality.', 'wordpress-seo' ), false );
$content .= '<div id="sitemapinfo">';
if ( isset($_SERVER['SERVER_SOFTWARE']) && stristr($_<strong>SERVER['SERVER_SOFTWARE'], 'nginx'</strong>) !== false ) {
$content .= '<div style="margin: 5px 0; padding: 3px 10px; background-color: #ffffe0; border: 1px solid #E6DB55; border-radius: 3px">';
<strong>$content .= '<p>'.__('As you\'re on NGINX, you\'ll need the following rewrites:','wordpress-seo').'</p>';
$content .= '<pre>rewrite ^/sitemap_index\.xml$ /index.php?sitemap=1 last;</strong>
rewrite ^/([^/]+?)-sitemap([0-9]+)?\.xml$ /index.php?sitemap=$1&sitemap_n=$2 last;</pre>';
$content .= '</div>';
==============================

Is this a known issue or it’s just me?

Backstory: I started a new website and installed a theme, including this plugin. Now I’m having a 310 Redirect Loop that renders my site useless. My host says to notify the plugin developer for this.

—

It could be my theme, but the error shows “wordpress-seo”. Just trying to isolate the problem.

http://wordpress.org/extend/plugins/wordpress-seo/