TypeMock 5.1.2: ComboBoxBarItem mocking will hang

Try the below code in TestDriven.Net:

        [Test, Isolated]
        public void ComboItemBarItemTest()
        {
            ComboBoxBarItem cb = Isolate.Fake.Instance<ComboBoxBarItem>(Members.ReturnRecursiveFakes);
            Isolate.WhenCalled(() => cb.Text).WillReturn("20");
        }

It will take ages for the test to finish running, even though if I step in using the debugger, I can pass through the two statements above. The program seems to hang at ClearMocks stage.
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