Quick-and-dirty howto:
1. Update plugin
2. Comment this
//$sociablepluginpath = plugins_url('', __FILE__).'/';
3. Insert this (function Edit in Admin interface) from the old plugin
$sociablepluginpath = WP_CONTENT_URL.'/plugins/'.plugin_basename(dirname(__FILE__)).'/';
4. Ready.
That can be an compatibility issue.
