UE 4.1
Using 10.9.3 I have my mouse wheel set to natural, so far every editor/window respects this and zoom in/out works in the correct way - scrolling the wheel towards me zooms in, scrolling the wheel away from me zooms out except the Material Instance window where it works opposite.
Hello,
Thank you for your report. We were not able to investigate this on the engine version you reported, but there have been many version changes to UE4 since this question was first posted. With a new version of the Engine comes new fixes and it is possible that this issue has changed or may no longer occur. Due to timetable of when this issue was first posted, we are marking this post as resolved for tracking purposes.
If you are still experiencing the issue you reported in the current engine version, then please respond to this message with additional information and we will investigate as soon as possible. If you are experiencing a similar, but different issue at this time, please submit a new report for it.
Thank you.