Hi all. I have a problem that I have spent ALL day racking my head on and cant figure it out. I have a logitech MX Master Mouse that is connected via the wireless dongle and has been great for months,after I updated to 10.11 the mouse was acting a little weird and now I can use the scroll wheel at all on the mouse. My apple wireless mouse works just fine with no issues. I have reinstalled the logictech program,Hell I even did a system restore from time machine back to when the mouse was working. Now when I got to my macbook (NON 10.11) it works fine! So I can rule out Hardware issue. I have tried connected the mouse via bluetooth as well and still the same problem. Now if I disconnect and reconnect the mouse again for a brief second the scroll wheel works then it just stops. Does anyone know how to fix this? Im going NUTS. Thanks for any help you can shed on this!