custom post types – not found (or infinite loop)

For some reason, wordpress is giving me real trouble with custom post types.

I’m using the following code to register the custom post type:

add_action('init', 'codex_custom_init');
function codex_custom_init()
{
flush_rewrite_rules();
  $labels = array(
    'name' => _x('Communities', 'post type general name'),
    'singular_name' => _x('Community', 'post type singular name'),
    'add_new' => _x('Add New', 'community'),
    'add_new_item' => __('Add New Community'),
    'edit_item' => __('Edit Community'),
    'new_item' => __('New Community'),
    'view_item' => __('View Community'),
    'search_items' => __('Search Communities'),
    'not_found' =>  __('No communities found'),
    'not_found_in_trash' => __('No communities found in Trash'),
    'parent_item_colon' => '',
    'menu_name' => 'Communities'

  );
  $args = array(
    'labels' => $labels,
    'public' => true,
    'publicly_queryable' => true,
    'show_ui' => true,
    'show_in_menu' => true,
    'query_var' => true,
    'rewrite' => array('slug'=>'comm'),
    'capability_type' => 'post',
    'has_archive' => true,
    'hierarchical' => false,
    'menu_position' => null,
    'supports' => array('title','editor','author','thumbnail','excerpt','comments')
  );
  register_post_type('community',$args);
}

I then create a new post as the new custom post type, but when I try and access the post, I get the following:

<strong>Not Found
</strong>
Apologies, but we were unable to find what you were looking for. Perhaps searching will help.

I’ve also gone to the wordpress dashboard and into settings->permalinks, but when I do that, and navigate to the post, I get an infinite redirect loop.

Any help would be much appreciated. I’m hoping I’ve made my point clear, but if I haven’t, I can provide more details.

Thanks in advance.