Multi-site issue

I have workarounded the issue adding "getenv('HTTP_HOST') ." prior to each call to session_name()

Sorry but i can't make the corresponding patch :(

Yes, you have proved to be rigth, but if needed by design I think it must be documented that a new sesion is needed for each time you are going to install the module on a multi-site scenario.

Thanks in advance.

You can just override the domain cookie in settings.php when sharing users and sessions table in a multisite scenario in order to get the users loged to all sites at the same time.

...
/**
 * We try to set the correct cookie domain. If you are experiencing problems
 * try commenting out the code below or specifying the cookie domain by hand.
 */
/*
if (isset($_SERVER['HTTP_HOST'])) {
  $domain = '.'. preg_replace('`^www.`', '', $_SERVER['HTTP_HOST']);
  // Per RFC 2109, cookie domains must contain at least one dot other than the
  // first. For hosts such as 'localhost', we don't set a cookie domain.
  if (count(explode('.', $domain)) > 2) {
    ini_set('session.cookie_domain', $domain);
  }
}*/
ini_set('session.cookie_domain', 'yourdomain.com');
...

If you need more info/testing I'm at your disposal.

If futher info is needed please follow up the issue telling me what you need.