Ervald

Why don’t you just echo the Title with a char limit?

ex.
$title = substr($post->post_title, 0, 40);

Place this to a page:

// For Custom posts

<?php
// Get 50 custom post types pages, set the number higher if is not slow.

$mycustomposts = get_pages( array( 'post_type' => 'name-of-post-type', 'number' => 50) );
   foreach( $mycustomposts as $mypost ) {
     // Delete's each post.
     wp_delete_post( $mypost->ID, true);
    // Set to False if you want to send them to Trash.
   }
// 50 custom post types are being deleted everytime you refresh the page.?>

// For terms

<?php
$taxonomy = 'my_taxonomy';

$terms = get_terms($taxonomy);
 $count = count($terms);
 if ( $count > 0 ){

     foreach ( $terms as $term ) {
        wp_delete_term( $term->term_id, $taxonomy );
     }
 }
?>

Line 267

class-sitemaps.php

No need for Plugin.

First get all user Emails, put them in array and use this function:

<?php wp_mail( $to, $subject, $message, $headers, $attachments ); ?>

How-To
http://codex.ww.wp.xz.cn/Function_Reference/wp_mail

Can you show us the code how the tab plugin shortcode is being generated?

Search for this add_shortcode in your tab plugin’s folder and it’s function.

function add_thumb_to_RSS($content) {
   global $post;
   if ( has_post_thumbnail( $post->ID ) ){
      $content = '' . get_the_post_thumbnail( $post->ID, 'thumbnail' ) . '' . $content;
   }
   return $content;
}
add_filter('the_excerpt_rss', 'add_thumb_to_RSS');
add_filter('the_content_feed', 'add_thumb_to_RSS');

To your functions.php

The problem comes from your functions file: wp-content/themes/colourise/functions.php

Go to wp_config.php,

find
define(‘WP_DEBUG’, false);

and turn it true
define(‘WP_DEBUG’, true);

And see what errors come up when you enter /wp-admin