I’ve had the same problem and even tried adding the cacert.pem file to my php installation folder and calling it via php.ini @ curl.cainfo = “/usr/local/lib/php/cacert.pem” without any luck
Stats:
PHP 5.6.16
cURL 7.38.0
Used the temp fix disabling the ssl for mailchimp posted to make it work for now.
Thanks for following up on this Danny! Hopefully a fix is around the corner