So I copied the sample code from the Moq home page pretty much verbatim, and am getting a castle proxy exception.

Here's my code (as a console app for an easier sample)

using System;
using System.Collections.Generic;
using System.Linq;
using System.Text;
using Moq;

namespace MoqTestConsole
{
    public interface ILoveThisFramework
    {
        bool DownloadExists(string s);
    }

    class Program
    {
        static void Main(string[] args)
        {
            Mock<ILoveThisFramework> mock = new Mock<ILoveThisFramework>();

            // WOW! No record/replay weirdness?! :)
            mock.Setup(framework => framework.DownloadExists("2.0.0.0")).Returns(true);

            // Hand mock.Object as a collaborator and exercise it, 
            // like calling methods on it...
            ILoveThisFramework lovable = mock.Object;
            bool download = lovable.DownloadExists("2.0.0.0");

            // Verify that the given method was indeed called with the expected value
            mock.Verify(framework => framework.DownloadExists("2.0.0.0"));
        }
    }
}

Everything compiles nicely, but when it calls mock.Object The following exception is thrown.

System.TypeInitializationException was unhandled
  Message=The type initializer for 'Moq.Mock`1' threw an exception.
  Source=Moq
  TypeName=Moq.Mock`1
  StackTrace:
       at Moq.Mock`1.<InitializeInstance>b__0() in d:\Code\moq\src\Source\Mock.Generic.cs:line 138
       at Moq.PexProtector.Invoke(Action action) in d:\Code\moq\src\Source\PexProtector.cs:line 56
       at Moq.Mock`1.InitializeInstance() in d:\Code\moq\src\Source\Mock.Generic.cs:line 136
       at Moq.Mock`1.OnGetObject() in d:\Code\moq\src\Source\Mock.Generic.cs:line 153
       at Moq.Mock.GetObject() in d:\Code\moq\src\Source\Mock.cs:line 152
       at Moq.Mock.get_Object() in d:\Code\
c# unit-testing testing mocking moq
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