Upgrade 2.0.2 to 3.1.10 session problem on local mamp

Here's my settings:

$config['cookie_prefix']    = '';
$config['cookie_domain']    = '';
$config['cookie_path']        = '/';
$config['cookie_secure']    = FALSE;
$config['cookie_httponly']     = FALSE;

I've tried with domain and a lot more different configuration. 
Thanks

Did you try this for the domain?

PHP Code:

$config['cookie_domain']    = ".example.com"; 


Note the period (.) before the domain.

While it should not make a difference I suggest using the following config item until you get everything else working.

PHP Code:

$config['sess_regenerate_destroy'] = FALSE;