OK here's my problem. Since updating to Win 8/8.1 my computer mouse scroll wheel has behaved erratically. It drifts, jumps and rolls back. My workaround is to click and use the scroll bars on a page and this is rock solid. I've googled and found this to be a fairly common complaint with no solution that works. I have a Logitech M950 Performance Mouse and all drivers etc are up to date. Has anyone a solution?