amg-smit

I have about 8 categories, and none of them are linked to specific pages, only archives, which are not listed in the page sitemap.

Ok, I can’t figure out what makes the difference, but registering my post types through a simple plugin, as advised by Andrew (read the first comment on this topic) and only calling the flush-function on activation does the job. The code is simple, feel free to use and adjust:

<?php

/*
Plugin Name: Custom post types
Plugin URI: http://wordpress.org/support/topic/permalinks-go-404-on-custom-post-types?replies=1#post-2301511
Description: This plugin registers CPT's and runs flush_rewrite_rules() on activation, which in some extraordinary cases makes automatic permalinking work. For more information see the help topic http://wordpress.org/support/topic/permalinks-go-404-on-custom-post-types?replies=1#post-2301511
Author: Josse Zwols & Geert Smit
Version: 1.6
Author URI: http://forgia.nl
*/

add_action( 'init', 'create_my_post_types' );

function create_my_post_types() {
	register_post_type( 'auctions',
		array(
			'labels' => array(
				'name' => __( 'Auctions' ),
				'singular_name' => __( 'Auction' )
			),
			'public' => true,
			'has_archive' => true,
		)
	);
	//flush_rewrite_rules( false );
}

register_activation_hook( __FILE__, 'create_my_post_types' );
register_activation_hook( __FILE__, 'flush_rewrite_rules' );

?>

Ok, so what you’re actually saying, is that I should register the post type with a plugin? Because that’s not what all the tutorials say, so this is kind of new to me. Untill now, I’ve put the code for registering the post type in the functions.php.

I think I know what to do for now: learning to create plugins, never did that before 🙂