Latest NUnit not running superclass setup/teardown in 2.4.7?

I'm having trouble getting something like this to work with NUnit  
2.4.7, but it works fine in 2.4.6:

class BaseClass {
     // fixture and test set-up and tear-down
}

class BaseSubClass : BaseClass {
}

[TestFixture]
class MyTestCase : BaseSubClass {
}


The tests in MyTestCase won't do any of the setup/teardown (both  
fixture and per-test) defined in the BaseClass.  Is this a bug or an  
intended breaking change?  Has anyone else seen this?

Thanks!
Doug

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