Hey,

file: class.soap_transport_http.php

method: setProxy

there is a line:

    if ($proxyusername != '' && $proxypassword != '' && $proxyauthtype = 'basic') {

should be probably:

    if ($proxyusername != '' && $proxypassword != '' && $proxyauthtype == 'basic') {

with "==".

best regards,
KKKas.