Hi , I've had this problem for roughly 3-4 months now and finally took initiative to inquire on what exactly is wrong with my mouse. I have the Tt Esports Black Mouse which worked perfectly fine for the 2 previous years I have been using it. Only recently (3-4 Months ago) has the scrolling button not work. Additionally the middle click within the scroller does work, but the actual scrolling up and down does not work. I've tried to re install the driver but it hasn't helped and I have downloaded the latest driver as well. If anyone could help me out that would be great, thanks.