Fail to auto login when enrol course with paypal. Need to key in user name and password again when click on enrol paypal button. I found that this is because no privateToken.
Please ignore this, solved, this is because our web site did not use https. for privateToken passing, site must be https and user is not admin. For ssl site, i faced too many redirect issue. But solved also with set sslproxy = 1 in config.php.