Problem Writing to Private Message Queue on Windows 7 64-Bit from .NET 2.0 Web Service

I have the following code in a web method of a .NET 2.0 VB web service application:

<WebMethod()> _
Public Function UpdateCall(<System.Xml.Serialization.XmlElement("CallChangeRequest")> ByVal callChange As CallChangeMessage) As Boolean

Dim result As Boolean = False
Dim mq As System.Messaging.MessageQueue = Nothing
Dim msg As System.Messaging.Message = Nothing
Try
    mq = New System.Messaging.MessageQueue(System.Configuration.ConfigurationManager.AppSettings("queueName"))
    mq.Formatter = New System.Messaging.XmlMessageFormatter(New Type() {GetType(CallChangeMessage)})

    msg = New System.Messaging.Message(callChange)
    msg.Recoverable = Convert.ToBoolean(System.Configuration.ConfigurationManager.AppSettings("recoverableMessages"))

    mq.Send(msg)

    result = True
Catch ex As Exception
Finally
    If Not (msg Is Nothing) Then msg.Dispose()
    If Not (mq Is Nothing) Then mq.Dispose()
End Try

    Return result

End Function

This code correctly serializes my object and writes an XML message to the message queue on my old local development machine, which was running Windows XP Pro 32-bit. It also performs correctly on the production server. After upgrading to Windows 7 64-bit, this code will no longer write the XML message in the message queue. The call to msg.Send(msg) does not raise an exception, so my web method returns true to the caller. However, no message is written to the queue, so the code is just quietly failing.

The messages are marked as Recoverable, and the queue name is FormatName:DIRECT=OS:.\private$\inbounddata. I've opened up the permissions for basically everyone to do everything. If there were a permission problem, I would expect to get some sort of exception, so I don't think I have a permission problem. 开发者_高级运维 The web service is running in an application pool targeting the 2.0 framework with managed pipeline mode set to Classic.

Up to now, my recourse has been to deploy the code on my old development box, which I still have hanging around, but I cannot do that forever. Is there a problem with my code that is causing this to fail? Does anyone know of any issues with writing to MSMQ on Windows 7 64-bit from a 32-bit .NET 2.0 framework app?

Thanks for any help!

Don't know what happened, but I deleted the existing queue, created a new queue, and now all is well. Thanks for the suggestions.