Resurrecting this thread to say that my recently purchased 324e is giving me the same issue, mainly on the D string. As has been mentioned, it is especially noticeable amplified, and it is NOT, I repeat NOT affected by posture; at least not with my guitar. It definitely sounds better fretted and with a capo. I took the guitar to the repair shop I generally use, and wouldn't you know it - the tech could not hear it. I was afraid that might happen. I described it as best I could. The guitar does need a set-up, so he's going to do that, and specifically make sure the nut and saddle are cool. He's also going to call Taylor to pick their brain on it. I'm hoping the set up takes care of it. I certainly hope the ES2 is not exacerbating the problem. I did try adjusting the screw for the D & G strings, but it made no difference. Any other thoughts, ideas, or new info on this D string "ping" issue?