Just from looking at the problem, however, I can't tell if there was a typo or not but the only thing that is being mocked is the IDbConnection rather than the decorator. Therefore, getting an actual unit test to look at would help clear that up and provide context.
Just for kicks, I would setup the mock as a Strict Mock. That way if anything is called that wasn't expected you will know. You could also try using a logger to get a better understanding of what is being called and what Rhino Mocks is doing.
Hope that helps
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