Me too. Running WordPress 4.7.2. Seems to have coincided with Facebook password change.
Fatal error: Uncaught exception ‘Facebook\Exceptions\FacebookAuthenticationException’ with message ‘Error validating access token: The session has been invalidated because the user has changed the password.’ in ../wp-content/plugins/fb-instant-articles/vendor/facebook/graph-sdk/src/Facebook/Exceptions/FacebookResponseException.php:89 Stack trace: #0 ../wp-content/plugins/fb-instant-articles/vendor/facebook/graph-sdk/src/Facebook/FacebookResponse.php(210): Facebook\Exceptions\FacebookResponseException::create(Object(Facebook\FacebookResponse)) #1 ../wp-content/plugins/fb-instant-articles/vendor/facebook/graph-sdk/src/Facebook/FacebookResponse.php(255): Facebook\FacebookResponse->makeException() #2 ../wp-content/plugins/fb-instant-articles/vendor/facebook/graph-sdk/src/Facebook/FacebookResponse.php(82): Facebook\FacebookResponse->decod in ../wp-content/plugins/fb-instant-articles/vendor/facebook/graph-sdk/src/Facebook/Exceptions/FacebookResponseException.php on line 89
Plugin not offering Facebook reauthentication, just fatal error. Also locks up entire plugin page so can’t edit, deactivate or delete Instant Articles for WP plugin.
Thank you for your assistance.