Issues with Subscriber.AddWithCustomFields in php

I am using the  PHP library and sample files, and I can't seem to get subscriberAddWithCustomFields to work.

subscriberAdd is working fine, but the soap service for subscriberAddWithCustomFields has an empty result (no error, nothing at all). Curl works fine on the server.

On line 221 of CMBase.php:

$res = curl_exec( $ch );

$res comes up empty.

Does anyone else use this function of the PHP class and get a result?

Even using the sample php implementation files provided returns nothing.

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