Strange Error calling method of wsdl based SOAP client

I'm talking to the Membersuite SOAP api. They have a Get() method and a Save() method for objects. I call Get(), and get an object back representing an individual. I pass it back to Save() and I get this: Fatal error: Uncaught SoapFault exception: [a:DeserializationFailed] The formatter threw an exception while trying to deserialize the message:

    There was an error while trying to deserialize parameter http://membersuite.com/contracts:objectToSave.

The InnerException message was

    'Element Value from namespace http://schemas.datacontract.org/2004/07/MemberSuite.SDK.Types
    cannot have child contents to be deserialized as an object. Please use XmlNode[] to deserialize this pattern of XML.'.
    Please see InnerException for more details. in /home/toby/public_html/membersuite/-:115
    Stack trace:
    #0 /home/toby/public_html/membersuite/-(115): SoapClient->__soapCall('Save', Array, NULL, Array, Array)
    #1 /home/toby/public_html/membersuite/-(18): Membersuite->call('Save', Array)
    #2 {main}
      thrown in /home/toby/public_html/membersuite/- on line 115

The whole store with source code is here:

    http://register.rcsreg.com/r2/membersuite

Thanks for any help. I've been working on this for over a month now. Tobiah