I found the same issue in the thread with the same name, but it was closed.
I have the same problem, but I don't see how to uninstall Authorize.net AIM module. Also, I login Admin via https://, but as soon as I click to payment modules the address switches to http://.

My configure.php is configured as such:
define('HTTP_SERVER', 'http://www.healthworksprofessional.com');
define('HTTPS_SERVER', 'https://www.healthworksprofessional.com');
define('HTTP_CATALOG_SERVER', 'http://www.healthworksprofessional.com');
define('HTTPS_CATALOG_SERVER', 'https://www.healthworksprofessional.com');

// secure webserver for admin? Valid choices are 'true' or 'false' (including quotes).
define('ENABLE_SSL_ADMIN', 'true');

// secure webserver for storefront? Valid choices are 'true' or 'false' (including quotes).
define('ENABLE_SSL_CATALOG', 'true');

The includes/configure.php is configured similarly.

Any help would be greatly appreciated.
Thanks
jim