If that does not solve your problem, the issue may be with how your touchpad drivers handle Mouse3 and the scroll. Different vendors customize the drivers in various ways. Lenovo, for example, has mouse3 set to activate panning mode (forces window scrolling left/right and up/down without activating the command for scrolling the mouse wheel). You may want to check your drivers to see how they are treating scrolling. The location of the settings should be under one of the tabs in "Mouse Properties" on the Control Panel.