@zactoff, I resolved it by downgrading to v 2.1.4:
http://wordpress.org/plugins/social-sharing-toolkit/developers/
I’m seeing the same issue!
bump.
@ricketts8 is it possible that you’re using a WordPress cache plugin – such as WP-Super-Cache? If so you may need to manually reset the plugin’s cache.
found the solution… It was a while back, either the single.php or the post.php file was missing. I simply copied index.php and renamed it.