SoapClient Returns "NULL", but __getLastResponse() returns XML

Hi,

I'm having troubles consuming a PERL Web Service with the WSDL generated by
Pod::WSDL.

This is the WSDL (trimmed as it is 800k):

http://pastebin.com/HP1ELVTQ

Can anybody see my error?  I've tried *many* different ways of instantiating
the client, but still "NULL" in the response object.

When I run this code:

$wsdl = "http://myserver/local/enswitch.wsdl";
ini_set("soap.wsdl_cache_enabled", "0"); // disable WSDL cache
$client = new SoapClient($wsdl, array('trace'=>true, 'exceptions'=>true));
$response = $client->get_queue_destinations($username, $password, $id);
print_r($response);  // Returns "NULL"

But:
print "Response: \n".$client->__getLastResponse()."\n";

spits out:
 
<?xml version="1.0" encoding="UTF-8"?>
<soap:Envelope
 xmlns:xsi="http://www.w3.org/2001/XMLSchema-instance"
 xmlns:soapenc="http://schemas.xmlsoap.org/soap/encoding/"
 xmlns:xsd="http://www.w3.org/2001/XMLSchema"
 soap:encodingStyle="http://schemas.xmlsoap.org/soap/encoding/"
 xmlns:soap="http://schemas.xmlsoap.org/soap/envelope/">
<soap:Body>
 <get_queue_destinationsResponse
  xmlns="http://es1.langineers.com/Integrics/Enswitch/API">
  <s-gensym37>
   <priority xsi:type="xsd:string">1</priority>
   <active xsi:type="xsd:string">0</active>
   <dtype xsi:type="xsd:string">phone</dtype>
   <dnumber xsi:type="xsd:string">1234206</dnumber>
   <id xsi:type="xsd:string">2228</id>
   <queue xsi:type="xsd:string">30</queue>
   <available xsi:type="xsd:string">0</available>
   <lasttime xsi:type="xsd:string">0</lasttime>
   <nexttime xsi:type="xsd:string">0</nexttime>
  </s-gensym37>
  <s-gensym39>
   <priority xsi:type="xsd:string">1</priority>
   <active xsi:type="xsd:string">0</active>
   <dtype xsi:type="xsd:string">phone</dtype>
   <dnumber xsi:type="xsd:string">1234672</dnumber>
   <id xsi:type="xsd:string">2227</id>
   <queue xsi:type="xsd:string">30</queue>
   <available xsi:type="xsd:string">1</available>
   <lasttime xsi:type="xsd:string">1314867027</lasttime>
   <nexttime xsi:type="xsd:string">0</nexttime>
  </s-gensym39>
 </get_queue_destinationsResponse>
</soap:Body>
</soap:Envelope>

Thanks in advance,

Shanon Swafford