it is not a calibre bug.
logitech software is a bit flaky, as is the mouse wheel on their MX anywhere mouse; but I can scroll both ways with my logitech MX570 trackball wherl using Win 7 & latest setpoint software. the MX mouse wheel scroll is awful in calibre but its awful in other programs also & logitech discussion boards / google confirm that other users have this issue.
But hey - it works smoothly on my glass desktop so I forgive the scroll issue & forgive the horrible battery short life also, f
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