[TheAdminMarket]

Any suggestion why the code below does not works as expected?

PHP Code:

<plugin active="1" executionorder="20">
    <title>Build Advertisments Block</title>
    <hookname>cache_templates</hookname>
    <phpcode><![CDATA[
        global $db, $vbulletin;
        $group = $vbulletin->db->query_first("SELECT * FROM ".TABLE_PREFIX."banners_groups WHERE active=1 ORDER BY lastshow ASC LIMIT 1");
        $groupid = $group["id"];
        $spots = $group["spots"];
        $random = $group["random"];
        $cellwidth = 100/$spots;
        // Update Group with Last Show Time
        $timenow = time();
        $vbulletin->db->query_write("UPDATE ".TABLE_PREFIX."banners_groups SET lastshow=$timenow WHERE id=$groupid ORDER BY id ASC");
        // List Group Advertisments
        if ($random == 1)
        {
            $advertisments = $vbulletin->db->query_read("SELECT * FROM ".TABLE_PREFIX."banners_advertisers WHERE groupid=$groupid AND active=1 ORDER BY rand() LIMIT $spots");
        } else {
            $advertisments = $vbulletin->db->query_read("SELECT * FROM ".TABLE_PREFIX."banners_advertisers WHERE groupid=$groupid AND active=1 ORDER BY displayorder ASC LIMIT $spots");
        }
        $main_bit = '';
        while ($advertisment = $vbulletin->db->fetch_array($advertisments)) {
            // Prepare Templates
            $templater = vB_Template::create('banners_main_bit');
            $templater->register('htmlcode', htmlspecialchars_uni($advertisment[htmlcode]));
            $templater->register('cellwidth', $cellwidth);
            $main_bit .= $templater->render();
        }
        $templater = vB_Template::create('banners_main');
        $templater->register('main_bit', $main_bit);
        $templatevalues['mybanners'] = $templater->render();
        vB_Template::preRegister('header', $templatevalues);
    ]]></phpcode>
</plugin> 


Taking in account that:

1. I used many different hooks like: global_start, global_complete, fetch_templates etc.
2. I also used many different templates like: ad_global_header1 etc
3. The same code with only difference the last 2 lines is working in php file if I use: print_output($templater->render());

Thank you very much

EDIT: What I was adding in the templates is: {vb:raw mybanners}