bbp_repair_forum_visibility()

function bbp_repair_forum_visibility() {

	// First, delete everything.
	delete_option( '_bbp_private_forums' );
	delete_option( '_bbp_hidden_forums'  );

	// Next, get all the private and hidden forums
	$private_forums = new WP_Query( array(
		'suppress_filters' => true,
		'nopaging'         => true,
		'post_type'        => bbp_get_forum_post_type(),
		'post_status'      => bbp_get_private_status_id(),
		'fields'           => 'ids'
	) );
	$hidden_forums = new WP_Query( array(
		'suppress_filters' => true,
		'nopaging'         => true,
		'post_type'        => bbp_get_forum_post_type(),
		'post_status'      => bbp_get_hidden_status_id(),
		'fields'           => 'ids'
	) );

	// Reset the $post global
	wp_reset_postdata();

	// Bail if queries returned errors
	if ( is_wp_error( $private_forums ) || is_wp_error( $hidden_forums ) )
		return false;

	// Update the private/hidden options
	update_option( '_bbp_private_forums', $private_forums->posts ); // Private forums
	update_option( '_bbp_hidden_forums',  $hidden_forums->posts  ); // Hidden forums

	// Complete results
	return true;
}