Exception on Environment.GetFolderPath in WhenCalled mock.

I have a method:

public string GetDefaultPath()
{
        return Environment.GetFolderPath(Environment.SpecialFolder.CommonDocuments, Environment.SpecialFolderOption.DoNotVerify);
}

Which I am trying to mock in my test as follows:

Isolate.WhenCalled(() => target.GetDefaultPath()).WillReturn(DefaultPath);

When I run my test, at the line where I call Isolate.WhenCalled I am getting the following error:

Test method MyNameSpace.MyClassTests.TestSetOptionsMethodSetsProperties threw exception:
System.MissingMethodException: Method not found: 'System.String TypeMock.Interceptors.EnvironmentInterceptor.GetFolderPath(SpecialFolder, SpecialFolderOption)'.
at MyNameSpace.MyClass.GetDefaultPath()
at MyNameSpace.MyClassTests.<>c__DisplayClass1.<TestSetOptionsMethodSetsProperties>b__0() in MyClassUnderTest.cs: line 45
at TypeMock.MockManager.getReturn(Object context, String typeName, String methodName, Object methodGenericParams, Boolean isDecorated, Boolean isInterceptedType, Object[] methodArguments)
at Typemock.Interceptors.Profiler.InternalMockManager.getReturn(Object that, String typeName, String methodName, Object methodParameters, Boolean isInjected, Boolean isInterceptedType)
at MyNameSpace.MyClassTests.TestSetOptionsMethodSetsProperties() in MyClassUnderTest.cs: line 0

I've written a small example class and test which demonstrates the problem. I'm wondering if I am missing a step or whether this is a possible bug in typemock. Any suggestions on how to workaround this issue?

namespace MyNameSpace
{
    using System;
    using Microsoft.VisualStudio.TestTools.UnitTesting;
    using TypeMock.ArrangeActAssert;

    internal class MyClass
    {
        private string _path = String.Empty;

        public string MyPath
        {
            get { return _path; }
            private set { _path = value; }
        }

        public string GetDefaultPath()
        {
            return Environment.GetFolderPath(
                Environment.SpecialFolder.CommonDocuments, Environment.SpecialFolderOption.DoNotVerify);
        }

        public void SetProperties_MethodUnderTest()
        {
            MyPath = GetDefaultPath() + @"ExtraPathDetail";
        }
    }


    [TestClass]
    public class MyClassTests
    {
        [TestMethod, Isolated]
        public void TestSetOptionsMethodSetsProperties()
        {
            var target = Isolate.Fake.Instance<MyClass>(Members.ReturnRecursiveFakes);
            const string DefaultPath = @"C:MyDefaultPath";
            Isolate.WhenCalled(() => target.GetDefaultPath()).WillReturn(DefaultPath);

            // Act
            Isolate.Invoke.Method(target, "SetProperties_MethodUnderTest");

            // Assert
            Assert.AreEqual(target.GetDefaultPath(), DefaultPath + @"ExtraPathDetail");
        }
    }
}