Go on record and keep a record so you can see how proactive you are and demonstrate it to others. It may seem you are loud and clear but in reality they didn't hear and you just didn't repeat it again. I am guilty of forgetting that the problem (and that I told about it) is top of only my own memory but for the boss it's very remote and needs repetition to sink in. Also guilty of trying to teach a lesson to make people listen better to me the first time but that's a bad idea too. And if people blame you later you can always throw email transcripts at them.