CSRF error on login

Hey php_rocs (btw love the nickname - yes, PHP rocks! lol),

To answer your very good questions:
1. Yes. Both are running version 5.4.16
2. No. Both are Linux servers (though the production server is in Azure - maybe that's part of it?)
3. 3.2.0-dev (kinda surprised it has "-dev" on the end - it was supposedly the latest stable version when I installed it). This is consistent across both servers.
4. I would be glad to... if I knew where it was coming from. Something somewhere in CI's guts is throwing the error; I never call anything CSRF-related apart from the config setup I already gave. And nothing is logged (so no stack trace or anything like that). But that actually gives me an idea; maybe if I increase the logging level to include debug and info messages, it would show me where the error is being thrown.

Anyway thanks for the suggestions! I actually learned a bit having to Google all these answers (lol), and I'm sure they'll come in handy for future projects. But for now, does any of this help?