Josh - Your plugin may have been hacked - Version 4.3 to 18.104.22.168 (maybe others)
When active, a link is being placed in the footer area
<p style="position: absolute; top: -987px (and other similar values)">By Castglosvb (and other names) <a href="(to casino and options trading sites" title="casino online (and other)">online casino (and other)</a></p> Link removed
The name, title and link changes with each page refresh
The link is placed in the same footer region as the "Powered by WordPress" etc
I've checked this on 2 live sites as well as a fresh install WP3.6 Beta test site and confirm all have this action. Disabling the plugin stops the link embed. I downloaded fresh copies from the repository and confirm both 4.3 to 22.214.171.124 have these bad links
I've posted a list of discovered links and names etc, and a copy of the html page so you can see the original source code from my dev site page (line 143) at http://www.graphicline.co.za/zimage/utmce-bad-links.zip
I'm going back to ver 3.0 (This version is clean) in the meantime for my live sites.