[Non Risolto] Cross Table Update o anche Join Update non vanno, 0 righe modificate...

Salve a tutti! Ho un problema con un update MySQL affetta da JOIN.
Di fatti, se eseguo la seguente select:

Codice:

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SELECT * FROM `site_animes` AS `Row` LEFT JOIN  (SELECT `forum_users`.`user_id`, `forum_users`.`username` FROM `forum_users` AS `forum_users`)  AS `User` ON `Row`.`user_id` = `User`.`user_id`  LEFT JOIN `site_anime_producers` AS `AnimeProducer` ON `Row`.`producer_id` = `AnimeProducer`.`id`  LEFT JOIN `site_languages` AS `Language` ON `Row`.`language_id` = `Language`.`id`  WHERE `Row`.`id` = 2

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http://img846.imageshack.us/img846/218/selecta.jpg

Ottengo dei risultati validi, ma se provo ad eseguire la seguente update:

Codice:

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UPDATE `site_animes` AS `Row`, `forum_users` AS `User`, `site_anime_producers` AS `AnimeProducer`, `site_languages` AS `Language` SET `AnimeProducer`.`name` = 'Fairy Tail' WHERE `Row`.`id` = '2' AND `Row`.`user_id` = `User`.`user_id` AND `Row`.`producer_id` = `AnimeProducer`.`id` AND `Row`.`language_id` = `Language`.`id`

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oppure la seguente:

Codice:

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UPDATE `site_animes` AS `Row` LEFT JOIN  (SELECT `forum_users`.`user_id`, `forum_users`.`username` FROM `forum_users` AS `forum_users`)  AS `User` ON `Row`.`user_id` = `User`.`user_id`  LEFT JOIN `site_anime_producers` AS `AnimeProducer` ON `Row`.`producer_id` = `AnimeProducer`.`id`  LEFT JOIN `site_languages` AS `Language` ON `Row`.`language_id` = `Language`.`id`  SET `AnimeProducer`.`name` = 'Fairy Tail' WHERE `Row`.`id` = '2'

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http://img84.imageshack.us/img84/4941/updateks.jpg

Mi ritorna sempre 0 righe modificate, anche se la riga con id 2 esiste.... sapete dirmi il perchè per favore?

Tabella site animes:
http://img807.imageshack.us/img807/7024/siteanimes.jpg

Ciao,
Mattia.