Buttons don't display in Chrome

I used custom button placement, and I noticed that the buttons no longer display when useragent=Chrome. Firefox works fine.

Demo page: http://www.brentpeters.me/wp/2013/01/2036

I am using this code in single.php
<span class='st_fblike_buttons' st_title='<?php the_title(); ?>' st_url='<?php the_permalink(); ?>' displayText='fblike'></span><span class='st_plusone_buttons' st_title='<?php the_title(); ?>' st_url='<?php the_permalink(); ?>' displayText='plusone'></span><span class='st_facebook_buttons' st_title='<?php the_title(); ?>' st_url='<?php the_permalink(); ?>' displayText='facebook'></span><span st_via='TheBrentPeters' st_username='TheBrentPeters' class='st_twitter_buttons' st_title='<?php the_title(); ?>' st_url='<?php the_permalink(); ?>' displayText='twitter'></span>

This may be related to changes in the Disqus plugin. I can’t say for sure because I don’t know if this problem preexisted changes to that plugin.

Help would be much appreciated.
Thanks!

http://wordpress.org/extend/plugins/share-this/