Something strange happened to my rMBP13 2015. I was accustomed to the silent clicking option of the trackpad, which produced a very soft haptic feedback and a soft click to the trackpad. Since TODAY, the "silent clicking" option in the trackpad preference panel it's unresponsive. No matter if it's checked or unchecked: there's absolute no change, the trackpad now always clicks with no change in loudness like it's stuck in the non-silent option. Functionality is OK: force click works, the haptic feedback is uniform in every zone of the pad, no problems whatsoever except for the constant clicky click. I'm running the last stable El Capitan and I've disabled the only two apps that could have interfered (SmoothMouse and Scroll Reverser). Any idea?