Multisite sem sem thumbnails no blog2 ! Help!

Olá a todos,

será que alguém consegue me resolver este problema? Já tentei ler muitos fóruns, suportes, dicas e nada.
Desde a versão 3.7 que deixei de trabalhar com multisites no wordpress, infelizmente por causa deste problema.

Fis uma nova instalação multisite.
– No primeiro site instalado no diretório base, tudo funciona bem.
– No segundo site instalado “/blog2”, os thumbnails não aparecem.

Já ando há dias às voltas com isto e não consigo nada. Infelizmente isto é um problema comum nestas últimas versões do wordpress.
____________________
Redireccionamento do .htaccess?
_____________________

‘RewriteEngine On
RewriteBase /
RewriteRule ^index\.php$ – [L]

# uploaded files
RewriteRule ^([_0-9a-zA-Z-]+/)?files/(.+) wp-includes/ms-files.php?file=$2 [L]

# add a trailing slash to /wp-admin
RewriteRule ^([_0-9a-zA-Z-]+/)?wp-admin$ $1wp-admin/ [R=301,L]

RewriteCond %{REQUEST_FILENAME} -f [OR]
RewriteCond %{REQUEST_FILENAME} -d
RewriteRule ^ – [L]
RewriteRule ^([_0-9a-zA-Z-]+/)?(wp-(content|admin|includes).*) $2 [L]
RewriteRule ^([_0-9a-zA-Z-]+/)?(.*\.php)$ $2 [L]
RewriteRule . index.php [L]’

______________________
WP-config mal configurado?
_____________________
‘<?php
/**
* The base configurations of the WordPress.
*
* This file has the following configurations: MySQL settings, Table Prefix,
* Secret Keys, WordPress Language, and ABSPATH. You can find more information
* by visiting {@link http://codex.wordpress.org/Editing_wp-config.php Editing
* wp-config.php} Codex page. You can get the MySQL settings from your web host.
*
* This file is used by the wp-config.php creation script during the
* installation. You don’t have to use the web site, you can just copy this file
* to “wp-config.php” and fill in the values.
*
* @package WordPress
*/

// ** MySQL settings – You can get this info from your web host ** //
/** The name of the database for WordPress */
define(‘DB_NAME’, ‘xxxxx’);

/** MySQL database username */
define(‘DB_USER’, ‘xxxxx’);

/** MySQL database password */
define(‘DB_PASSWORD’, ‘xxxxx’);

/** MySQL hostname */
define(‘DB_HOST’, ‘localhost’);

/** Database Charset to use in creating database tables. */
define(‘DB_CHARSET’, ‘utf8’);

/** The Database Collate type. Don’t change this if in doubt. */
define(‘DB_COLLATE’, ”);

/**#@+
* Authentication Unique Keys and Salts.
*
* Change these to different unique phrases!
* You can generate these using the {@link https://api.wordpress.org/secret-key/1.1/salt/ WordPress.org secret-key service}
* You can change these at any point in time to invalidate all existing cookies. This will force all users to have to log in again.
*
* @since 2.6.0
*/
define(‘AUTH_KEY’, ‘XXxxxxxxxxxxxx’,

/**
* Other customizations.
*
*/
define(‘FS_METHOD’,’direct’);define(‘FS_CHMOD_DIR’,0755);
define(‘FS_CHMOD_FILE’,0755);
define(‘WP_TEMP_DIR’,dirname(__FILE__).’/wp-content/uploads’);

/**
* Multi-site
*
*/
define(‘MULTISITE’, true);
define(‘SUBDOMAIN_INSTALL’, false);
$base = ‘/’;
define(‘DOMAIN_CURRENT_SITE’, ‘testes.sotnasdesign.com’);
define(‘PATH_CURRENT_SITE’, ‘/’);
define(‘SITE_ID_CURRENT_SITE’, 1);
define(‘BLOG_ID_CURRENT_SITE’, 1);
define(‘WP_ALLOW_MULTISITE’, true);
define( ‘UPLOADBLOGSDIR’, ‘wp-content/uploads’ );

/**#@-*/

/**
* WordPress Database Table prefix.
*
* You can have multiple installations in one database if you give each a unique
* prefix. Only numbers, letters, and underscores please!
*/
$table_prefix = ‘testes_’;

/**
* WordPress Localized Language, defaults to English.
*
* Change this to localize WordPress. A corresponding MO file for the chosen
* language must be installed to wp-content/languages. For example, install
* de_DE.mo to wp-content/languages and set WPLANG to ‘de_DE’ to enable German
* language support.
*/
define(‘WPLANG’, ‘pt_PT’);

/**
* For developers: WordPress debugging mode.
*
* Change this to true to enable the display of notices during development.
* It is strongly recommended that plugin and theme developers use WP_DEBUG
* in their development environments.
*/
define(‘WP_DEBUG’, false);

/* That’s all, stop editing! Happy blogging. */

/** Absolute path to the WordPress directory. */
if ( !defined(‘ABSPATH’) )
define(‘ABSPATH’, dirname(__FILE__) . ‘/’);

/** Sets up WordPress vars and included files. */
require_once(ABSPATH . ‘wp-settings.php’);’

Obrigado pela vossa ajuda.