FatalExecutionEngineError

I am receiving the error message for only a specific set of tests in the test fixture. If I switch type mock off the tests run perfect.

Details of the message:

"The runtime has encountered a fatal error. The address of the error was at 0x79e7b7b1, on thread 0x8c4. The error code is 0xc0000005. This error may be a bug in the CLR or in the unsafe or non-verifiable portions of user code. Common sources of this bug include user marshaling errors for COM-interop or PInvoke, which may corrupt the stack."

Thus far I have been able to reproduce this error consistently but am however unable to place any other code here accept this sample for now:

[Test]
public void TestModelSearchPercentageWithValidMax()
{
decimal? factor = ModelSearch.FindPercentageFactor(25M,null);
Assert.AreEqual(2.0M, factor.Value);
}

The error occurs on the "FindPercentageFactor" signature, it is not even possible to debug and step into that method. I am using VS2005 and TypeMock 3.5.1.0. This fixture also does not make use of any mocking but it does have TypeMock referenced because there is another fixture class in the same assembly which uses mocking.

I can send you the .out files I have, please can you let me know if you need them?

Best regards,
JD