On my site, I'm not using a subdomain, instead I have bbPress located in a seperate folder from my WordPress installations ( localhost/wordpress and localhost/bbpress). I modified the code somewhat and it the problem hasn't subsided.

Here's my modified code in bbPress's config.php:

// Cookies, bbPress fix
$bb->cookiedomain = 'localhost';
$bb->cookiepath = '/';

Thanks!

for both bbPress and WordPress
the domain should be .salatti.net (note the first .)
the path should be /

So in bbPress' config.php:

$bb->cookiedomain = '.salatti.net';
$bb->cookiepath = '/';

in WordPress' wp-config.php:
define('COOKIE_DOMAIN', '.salatti.net');
define('COOKIEPATH', '/');
define('SITECOOKIEPATH', '/');

Let us know how it works.

Thanks,
Daniele