There's also the bug with the Hyperopia talent where increasing Perception decreases your accuracy (even though you're supposed to be accurate). From what I've read elsewhere, this is because Hyperopia causes you to be 100% accurate at a fixed Perception amount. As you increase Perception, your range increases, and your accuracy decreases from 100% the further range you go out. So if you take Hyperopia and gradually increase your Perception, you will soon find your shots missing again.