Mention tags and Facebook social publisher

I’ve followed the instructions on how to setup this plugin over at the facebook developers site: https://developers.facebook.com/wordpress/

So, essentially I created an app, associated it with my page, and the basic features appear to be working fine, for example comments, recommendations, and adding posts to the timeline.

But, the one thing I can’t get to work is mentioning other pages or other facebook accounts.
I have tried using the @ syntax (as the instructions show), but this doesn’t work, it just posts the user’s name with an @ before it, as it doesn’t give me the option to choose the name from the dropdown.

But also, on the social publisher page, part 2 still shows that I haven’t associated an Open Graph action-object pair for your application: people can publish an article.

Checking the app details page I can see that the action pair exists, but I am unable to submit (guess it needs to be approved) until I publish the action. How am i supposed to do that??? How can I publish the action before it’s submitted, and how can I submit it before it’s published???
There is nothing about this step in facebook’s instructions, any ideas what I should be doing to “publish the action”?

Thanks

http://wordpress.org/extend/plugins/facebook/