I am having the same problem has Sam had with the 1062-Duplicate entry error.
The payment goes through etc, its just the ugly long error warnings on the bottom of the screen that looks horrible.
I have checked my cookie_domain paths, and unfortunately no typos there :(
Just to check tho, I have a dedicated SSL , so can someone just confirm that my settings should be...
define('HTTP_COOKIE_DOMAIN', 'xxxxxxx.com');
define('HTTPS_COOKIE_DOMAIN', 'secure.xxxxxxx.com');
define('HTTP_COOKIE_PATH', '/store/');
define('HTTPS_COOKIE_PATH', '/store/');
obviously i have substituted xxxxxx's for my real domain.
I have been trying so many different settings over the last few days to get this working, but whatever I try doesnt seem to work..
Any help anyone?