I just started using IR V4 and tought I should do my part in testing the beta.
So far, I've only found a minor error with Xan's moonblade. The description says it should give +40% fire resist, but it actually gives +50%. This was already reported last year by someone else, but since there has been many update since, I thought it might be best to report it again.
The AC description was changed to 1 and matches the actual bonus, so that parts fine.