Disable Captcha plugin

Thanks sam2kb, that solved it though now spammers can comment freely on the blog...

I upgraded to latest b2 version as you suggested. Upon doing it tags that were accented (Spanish) got corrupted (look at the tags in this post: http://www.literanova.net/blog5.php/el-fracaso-de-pastor-maldonado) Do you know how to correct this?

First see if you get spam comments within a couple of days. If you will then install reCaptcha plugin and disable AJAX forms on Blog Settings > Advanced

http://forums.b2evolution.net/viewtopic.php?t=22963

As of tags encoding, convert your b2evolution DB to UTF-8 with this script. Save it as convert-db.php in b2evolution base directory (same where admin.php file is) and run with

http://yourwebsite.tld/convert-db.php

<?php
/**
 * Convert your b2evolution DB to UTF-8.
 * Place this script in the folder where "blogs" resides (is a subfolder of)
 * and execute it from the command line (or from your browser).
 *
 * @author http://daniel.hahler.de/
 * @license Public Domain
 */

/**
 * Change this to 0, if you do not want the DB default charset to be changed.
 * This is used for new tables (e.g. from plugins).
 */
define( 'ALSO_CHANGE_DB_DEFAULT', 1 );


error_reporting(E_ALL);
ini_set('display_errors', 1);

require dirname(__FILE__).'/conf/_config.php';
require $inc_path.'_main.inc.php';

$DB->halt_on_error = true;

foreach( $DB->get_col('SHOW TABLES FROM `'.$db_config['name'].'` LIKE "'.$tableprefix.'%"') as $table )
{
	echo "Converting $table... ";
	$DB->query( '
		ALTER TABLE `'.$table.'`
		DEFAULT CHARACTER SET utf8 COLLATE utf8_general_ci,
		CONVERT TO CHARACTER SET utf8 COLLATE utf8_general_ci' );
	echo "OK.\n";
}

if( ALSO_CHANGE_DB_DEFAULT )
{
	echo "Changing default charset of DB...";
	$DB->query( 'ALTER DATABASE `'.$db_config['name'].'` CHARACTER SET utf8 COLLATE utf8_general_ci' );
	echo "OK.\n";
}

?>

Backup your database before you start