To reproduce:
Open AsynchronousSample
Run validation.

XML validation started.
C:/Documents and
Settings/Mike/AsynchronousSample1/AsynchronousSample1/src/AsynchronousSample.wsdl:42,8
Output in binding operation "asyncOperation" in binding "SoapBinding" should
match output in the corresponding operation in portType "MyPortType".  : Ensure
that the output (if any) in portType operation "asyncOperation" has a matching
counterpart in the corresponding binding operation. 

Problem is that the binding declaration includes an output declaration but the
port does not. So there is a mismatch. Surprisingly this was never reported
before. Perhaps the WSDL validation is more strict now.

    <binding name="SoapBinding" type="tns:MyPortType">
        <soap:binding style="document"
transport="http://schemas.xmlsoap.org/soap/http"/>
        <operation name="asyncOperation">
            <soap:operation/>
            <input>
                <soap:body use="literal"/>
            </input>
            <output>
                <soap:body use="literal"/>
            </output>
        </operation>           
    </binding>

Fix is to modify the WSDL and remove the incorrect output element from binding.

P1 since this is blocking testing of samples.