> you should have a unit test to exercise the bug. This! Once you've got your test you can start factoring code out of the equation and if you get to the point

> you should have a unit test to exercise the bug. This! Once you've got your test you can start factoring code out of the equation and if you get to the point where your application code is no longer involved, well then that's an OS / library / framework bug but yes that's pretty rare.