VMware VIX API FindItems() method never returns when querying for registered VMs

using System;
using VixCOM;

namespace ConsoleApplication48
{
    internal class Program
    {
    	private static void Main()
    	{
    		var lib = new VixLibClass();
    		object results = null;

    		var job = lib.Connect(Constants.VIX_API_VERSION, Constants.VIX_SERVICEPROVIDER_VMWARE_WORKSTATION, null, 0,
null, null, 0, null, null);

    		var err = job.Wait(new[] {Constants.VIX_PROPERTY_JOB_RESULT_HANDLE}, ref results);

		if (lib.ErrorIndicatesFailure(err))
			Console.WriteLine("Error: " + err);

		var host = (IHost)((object[])results)[0];

		job = host.FindItems(Constants.VIX_FIND_REGISTERED_VMS, null, -1, new DiscoveryCallback(lib));
		job.WaitWithoutResults();

		host.Disconnect();
	}
}

internal class DiscoveryCallback : ICallback
{
	protected VixLibClass lib;

	public DiscoveryCallback(VixLibClass lib)
	{
		this.lib = lib;
	}

	#region ICallback Members

	public void OnVixEvent(IJob job, int eventType, IVixHandle moreEventInfo)
	{
		// this method is never called
	}

	#endregion
    }
}