WPBOOK LITE Access token issue when posting to facebook

Hi all

I have recently been using wpbook lite on a few different blogs, and yesterday one of the users reported the following error on one of them

Caught exception in publish to page Error validating access token: Session does not match current stored session. This may be because the user changed the password since the time the session was created or Facebook has changed the session for security reasons. Error code: 0

I have since checked the others and I too and getting the same error.

As of a week ago, it was working with no issues at all, so I am assuming that something has most likely changed within Facebook once again.

I have reset the App secret and reissues the token, removed and reinstalled the plugin and reissued the token, and only have the ‘website’ option enabled in the facebook application (rather than also having the ‘app on facebook’ setting activated as I do not currently have an option for https)

Would anyone know the cause of this issue, so that I can get things back to operational, as I am now thinking I am missing something simple that will solve these concerns

Thanks
b