Hi I am also experiencing the same issue. Here is the error code i get when activating the plugin: Fatal error: Call to a member function getConfigs() on a non-object in /data/12/1/129/32/1129358/user/1197258/htdocs/wp-content/plugins/addthis/addthis_social_widget.php on line 1086
My clients are not very happy about this. Please let me know what i can do, if anything, to help resolve this error