Occasional error "there must be a mocked statment first

Hello,

I mock using natural mocks method calls on an internal class member variable. The code looks like this:

using (RecordExpectations recorder = new RecordExpectations())
{
recorder.VerifyMode = VerifyMode.PassIfNotCalled;
obj.member.IsReady();
recorder.Return(true).RepeatAlways();
}

The unit test has a call to IsReady method on obj.member. Everything works fine if I test from VS 2005. When I run tests from command-line (I do execute mocking_on.bat), then sometimes "recorder.Return" call throws the following exception:

*** Cannot use Return in this sequence, there must be a mocked statment first
at TypeMock.RecordExpectations.a(String A_0)
at TypeMock.RecordExpectations.Return(Object returnValue)

So it looks it ignores my call to obj.IsReady. But not always! What can be wrong? Is there any workaround?

Thanks for any tips

Vagif Abilov