Vista - Why does MetadataResolver.Resolve() timeout when creating a newWindows Form?

Running the following code snippet with this line commented:
Form form = new Form();

Yields the expected results: writes "DisplayMessage" on the console.
However, the call to MetadataResolver.Resolve() takes at least about 4
seconds to complete. Why?

With the above line uncommented (i.e., with the form created), the
call to MetadataResolver.Resolve() fails by timeout ("Metadata
contains a reference that cannot be resolved"). Why?

I suspect deadlock, but can't explain it.

Visual Studio 2005
Microsoft .NET Framework, Version 2.0.50727.1433
System.ServiceModel 3.0.0.0

**** CODE FOLLOWS ***
using System;
using System.Diagnostics;
using System.ServiceModel;
using System.ServiceModel.Description;
using System.Windows.Forms;

namespace WcfForm
{
class Program
{
private static void Log(string message)
{
Console.Out.WriteLine(DateTime.Now + ": " + message);
}

static void Main(string[] args)
{
Log("Setup service...");
try
{
// Uncommenting this line will cause the
// MetadataResolver.Resolve() call to fail.
// Why?
//Form form = new Form();

string localAddress = "net.pipe://localhost/IService";
string mex = "Mex";

Type serviceType = typeof(Service);
Type contractType = typeof(IService);

ServiceHost serviceHost = new ServiceHost(
serviceType, new Uri[] { new Uri(localAddress) });

// add the named pipe service endpoint for local
clients
serviceHost.AddServiceEndpoint(
contractType, new NetNamedPipeBinding(),
localAddress);

// add the metadata behavior
ServiceMetadataBehavior metadataBehavior = new
ServiceMetadataBehavior();

serviceHost.Description.Behaviors.Add(metadataBehavior);

// add the metadata named pipe endpoint for local
clients
serviceHost.AddServiceEndpoint(
typeof(IMetadataExchange),

MetadataExchangeBindings.CreateMexNamedPipeBinding(),
mex);

// start the service
Log("Call serviceHost.Open()...");
serviceHost.Open();
Log("Service started.");

// resolve the endpoints for the locally hosted
service
// this call takes at least about 4 seconds to
complete when
// the form is not created and fails with a timeouts
out
// when the form is created. why?
Log("Call MetadataResolver.Resolve()...");
Stopwatch stopwatch = new Stopwatch();
stopwatch.Start();
ServiceEndpointCollection endpoints =
MetadataResolver.Resolve(
contractType, new EndpointAddress(localAddress +
"/" + mex));
stopwatch.Stop();
Log("Call to MetadataResolver.Resolve() took " +
stopwatch.Elapsed.Seconds + " sec. " +
stopwatch.Elapsed.Milliseconds + " ms.");

if (endpoints != null)
{
foreach (ServiceEndpoint endpoint in endpoints)
{
Log(endpoint.Address.ToString());
}
}

// create proxy and call service
Log("Create proxy ...");
ChannelFactory<IService> factory =
new ChannelFactory<IService>(new
NetNamedPipeBinding(), localAddress);

IService plugin = factory.CreateChannel() as IService;
if (plugin != null)
{
plugin.DisplayMessage();
}
}
catch (Exception ex)
{
// when form is created, this code fails by timeout
// "Metadata contains a reference that cannot be
resolved"
Log(ex.Message);
}
Console.ReadKey();
}
}

[ServiceContract]
public interface IService
{
[OperationContract]
void DisplayMessage();
}

public class Service : IService
{
public Service()
{
}
public void DisplayMessage()
{
Console.WriteLine("DisplayMessage");
}
}
}
**** END CODE ***