[support] cannot login, index.php?q=user not working

[Lluís Forns]

My site was working fine (an old drupal 5) and suddenly  stopped
working when editing some views and themes (i think this is no
related).

The system don't give any error when logging, but I can access just to
front page. Any hint? the site is
http://www.escoltesiguies.cat/index.php?q=user

I have truncated cache tables, cleared cookies of all my browsers
(firefox, chrome, chromium, opera) with no luck.

I have updated the core but it didn't work also.

I thought it was cookie-related, but I updated my settings.php with
<?php
$cookie_domain = 'escoltesiguies.cat';
?>
with no luck.

Any hint?

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*La vida és com una taronja, què esperes a exprimir-la?
*Si creus que l'educació és cara, prova la ignorància.
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només una vegada.
*Abans d'imprimir aquest missatge, pensa en el medi ambient.