[AtomicAcidbath]

Fix for 'Show Similar Threads' problem in 4.x

File: gateway.php

At line 586, Find:

if ($vbulletin->options['similarthreadsearch'])
{
     require_once(MY_DIR . '/includes/functions_search.php');
     $similarthreads = fetch_similar_threads($subject);
}

Replace with:

if ($vbulletin->options['similarthreadsearch'])
{
     require_once('./global.php');
     require_once(DIR . '/vb/search/core.php');
     $searchcontroller = vB_Search_Core::get_instance()->get_search_controller();
     $stl = $searchcontroller->get_similar_threads($subject);
     $similarthreads = implode(',', $stl);
}

Rename all occurrences of variable $foruminfo something else like $forum_info. It's in there 6 times.