Gameplay strategies are always changing. Potential areas of imbalance (usually in terms of a strategy/build, sometimes unique to a civilization) will warrant a topic in this forum.
To be an effective gameplay tester, you should:
Install SVN and update before testing. See Trac for instructions.
Be transparent. Maybe you have some crazy cool technique you want to keep secret, but as a tester interested in improving the game for everyone, you should try to employ and teach the alt