So I rolled out the plugin yesterday on my photography site, and it works like a charm, though there are some CSS issues with FB and Facebook (I can't remember if they existed pre-1.3.0) where the text is black on my gray background (unlike the white background of the G+ tab).
I tried loading it on one of my other sites, and am getting no joy though. I've tried disabling nearly every plugin that could possibly affect a blog post, and it just won't load - all I get is the WP comment box.
There are some differences in installs that may be a clue, so I'm looking for ideas. On the site that works, I was able to use a verified email address to link the pages back. For this site, however, I had to use the alternate method of adding code to the site - I don't have any email addresses associated with the URL. So, I'm using the Google Author Link plugin (http://wordpress.org/extend/plugins/google-author-link/) which passes Google verification, and I've also tried hard-coding it in the footer instead (which also passed).
Theme is 'Origin' by Alien WP (http://wordpress.org/extend/themes/origin)
Sample page is here - http://www.nomdujour.net/?p=147