Comment 6 for bug 624749

On latest source (and on 0.91 release), I have no horizontal scrolling on Windows 8.1 either. I do not think it's a driver issue, since I'm using a regular mouse on a desktop. Shift-scroll does nothing, while normal scrolling works as usual in the vertical direction.

As a work around for now, I'm using the space+mouse movement for horizontal motion, but it's less than ideal.