SSL works for Admin, Account Creation, NOT Login

I am setting up ssl on an almost virgin install of zc-1.3. SSL is working fine for the admin system, and curtomers can use secure creation of new accounts fine, but they can NOT log in with SSL enabled. it just kicks them back to the main page as a non-logined (:wacko: ) user, and invites them to try logging in over again. I've spent a couple of hours looking through the forum and can find similar, but not quite the same or helpful examples. any ideas?

here's my config->sessions

Session Directory /home/takspeed/takspeed.com/shop/cache
Cookie Domain True Info
Force Cookie Use False Info
Check SSL Session ID False Info
Check User Agent False Info
Check IP Address False Info
Prevent Spider Sessions True Info
Recreate Session True Info
IP to Host Conversion Status true

end here's the relevant sections of admin/include/configure.php and include/configure.php respectively.

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define('HTTP_SERVER', 'http://www.takspeed.com');
define('HTTPS_SERVER', 'https://www.takspeed.com');
define('HTTP_CATALOG_SERVER', 'http://www.takspeed.com');
define('HTTPS_CATALOG_SERVER', 'https://www.takspeed.com');

// Use secure webserver for catalog module and/or admin areas?
define('ENABLE_SSL_CATALOG', 'true');
define('ENABLE_SSL_ADMIN', 'true');

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define('HTTP_SERVER', 'http://www.takspeed.com');
define('HTTPS_SERVER', 'https://www.takspeed.com');

// Use secure webserver for checkout procedure?
define('ENABLE_SSL', 'true');