Logitech m100 mouse scrollwheel not working
I have a Logitech m100 USB mouse (very basic, two buttons & scrollwheel) hooked up to my iMac 12,2 which has worked flawlessly with past systems (10.6-10.11). After upgrading to macOS Sierra, the scrollwheel now seems to have a threshold speed at which you must be rolling it before it works. If you move the scrollwheel slowly on, for example, a web page to scroll down the page, it will never scroll. This doesn't happen with my Apple wireless mouse.
iMac (27-inch Mid 2011), macOS Sierra (10.12)