I picked up the pack a couple days ago and ran into what sounded like the same interaction issue mentioned in the 3rd post (keys and mouse wheel worked, but hovers and clicks did not), but the config files seemed ok. I have two machines that I work on, but only one of them had the issue. Long story short after a bunch of reinstalls and comparisons, everything is exactly the same on both machines. The machine with the issue however has two monitors of differing resolutions, with the Primary monitor on the right (where I use UE4). When I disable the Secondary (left) monitor, the UI finally behaved normally. I’m guessing it has something to do with how mouse coordinates are determined for the pointer, but I don’t know if it’d be an engine bug or something you can fix in the BP. Either way it’s working for now with a non-ideal workaround, but thought you might want to take a look if you can. Running 1.43 in a fresh 4.9.1 project.