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I worked with dorian c on resolving the issue with horizontal scrolling/zooming. The problem was that I was only inverting mouse axis 1 events and not axis 2 events. He suggested adding zoom/scroll factors for slowing down particular scroll types, so I added those as well. Edit: Removed attachment since the first post has the latest version attached to it

Not sure what the problem is for you, it works fine for me. I have attached the source code to this post. The section of code that handles inverting is the EventTapCallBack function in the ZoomInverter.m file. LogicZoomInverter.zip Source code

I am not having this problem. The scroll direction switches when the checkboxes are checked, and doesn't when they are not checked. Are you using the same key commands listed next to each checkbox? If not, then it won't work.

I wrote this application to invert the horizontal zoom, vertical zoom and horizontal scroll directions. It also has sliders to control the speed for each scroll/zoom type. You need to enable access for assistive devices in the universal access system preference pane for this program to function. LogicZoomInverter.zip