Thanks Scott for your fix. I was getting this error when saving on v1.4.7 and now it's gone :)
Here it is for those who want a quick solution:
Edit /wordpress-seo/admin/class-metabox.php, line 1058 add:
elseif ( apply_filters( 'wpseo_use_page_analysis', true ) !== true ) {
$result = new WP_Error( 'page-analysis-disabled', sprintf( __( 'Page Analysis has been disabled.', 'wordpress-seo' ), $post->post_type ) );
return $result;
}