[Plugin: HeadSpace2 SEO] New post breaks RSS feed

When a new post is published, the RSS feed breaks off after this bit:

<?xml version="1.0" encoding="utf-8"?>
<rss version="2.0"
	xmlns:content="http://purl.org/rss/1.0/modules/content/"
	xmlns:wfw="http://wellformedweb.org/CommentAPI/"
	xmlns:dc="http://purl.org/dc/elements/1.1/"
	xmlns:atom="http://www.w3.org/2005/Atom"
	xmlns:sy="http://purl.org/rss/1.0/modules/syndication/"
	xmlns:slash="http://purl.org/rss/1.0/modules/slash/"
	>

<channel>
	<title>Site Title

Which results in the RSS feed being completely useless. Oddly, some of my other, smaller blogs work fine with the latest WP & Headspace2 combination. Any idea what may cause this?

When I disable the plugin and re-enable it, the feed comes back.