Hi Andrew -
Thank you for the response! In this particular case, I don’t think the issue is simply the result of the “Natural” scrolling direction option in the Trackpad/Mouse System Preference, introduced in Mac OS X 10.7 Lion - if so ALL of the scrollable regions within UE4 would be inverted; instead it appears to only inflict some scrollable regions like the Blueprint Event Graph and sadly the scroll direction setting in the System Preference doesn’t seem to have any impact on the Event Graph.
The “Natural” scrolling direction takes a direct manipulation view of scrolling, (likely due in part to the growing numbers of and in turn familiarity with touch screen devices), where the content moves in the direction of the fingers, as if you had a piece of paper underneath; push fingers up, content moves up thusly scrolling down and similarly, push fingers to the left, content moves left thusly scrolling right. Previous Mac OS X releases in fact had the opposite scrolling behavior and the “Natural” became the default as of OS X 10.7, though it can be disabled by the user.
If I change my scroll direction in: System Preferences > Trackpad > Scroll & Zoom to disable “Natural” direction, it does not change the scrolling direction in the Event Graph (though it does in 1D scrollable regions like the World Outliner) - it is as if the Event Graph were hardwired to a specific direction!
Is the source for this region available in the GitHub project, if so I’d happily give it a look.