Recently specced disc to check it out, and noticed atonement wasn't working in my 5 man. It wasn't healing the tank (or anyone) who was standing right on top of the mob I was smiting. After it was done, me and another priest from my guild went to training dummies, and I SW: D'ed to almost no hp, stood on top of the dummy, and neither of our smites were healing. He claims his atonement was working correctly yesterday. Every now and then just from smiting with me sitting at ~3k hp I would get divine aegis to proc from seemingly nothing, kinda like atonement wants to heal me but can't. A third priest with atonement shows up, and his isn't working either, I'm wondering if this was hotfixed nerfed, or if there is something about it I'm just not getting.
Long story short: Specced into atonement, very low hp, standing on target I'm smiting, no heal.