I’ve installed the latest plugin version on the latest wordpress version (it did the same problem on WP 3.5.0).
It worked fine until I used the widget then the plugin started to wrote ratings_score:, ratings_average: (in text format) in the post (the plugin seems to write the rating stats in post content/meta in the database) then impossible to get rid of those rating information from the post page (I have tested to rate only 2 posts) even after deactivating and deleting the plugins. Of course I did have a database backup. But it is that a bug, a compatibility problems with the widget or I miss something.
The plugins is perfect, it fit my needs, but I do not want those rating in text format stuck in the database, what is wrong?