I'm here "refurbishing" a couple of old Mighty Mice (cracking them open to clean out the scroll ball area), and while that's going fine, my computers don't seem to be recognizing any of the secondary click buttons at all. 10.11--on two different Macs--sees the mice and offers to let me configure secondary right click, "squeeze click", and mouse-ball click, but none of them do anything--just the primary click and 4-way scrolling. I'd say "oh, they're just broken", except one was doing it even before I opened it up (and hadn't been abused previously), there's no apparent internal or external damage, and when I squeeze the side button, the mouse's internal speaker produces a click sound as expected. ...except it works fine on my work computer. It seems like if the mouse is making a click sound from its speaker, it must be detecting the squeeze click (and that click additionally doesn't rely on the internal ribbon cable, so it shouldn't be affected even if I broke the ribbon cable somehow). Likewise for the scroll-ball-click--if the little sub-unit can detect scrolling, it seems like the ribbon cable should be fine and the click detect should work, too. What's going on? Is there something in software that could cause this that I'm missing?