With that latest version you have linked, nothing shows up in the error log when I scroll horizontally. In the version from Sep 11, scrolling in the opposite direction (trying to go to the right) gives me:
19-09-12 7:18:26 PM - True,True,lparam=46205429,rparam=-7864320,4
19-09-12 7:18:45 PM - True,True,lparam=53742107,rparam=-7864320,4
Sorry, I didn't notice this until now, but with the app versions you have linked in this thread, scrolling to the right now produces the same kind of visual bug as scrolling to the left. It gives me what you see in this screenshot:
https://imgur.com/siXAIAq . In the previous version of the app that I was using when I started this thread (3.2.6902... I know, a bit old, but I was sticking with it due to an issue I had found at one point with syncing to an iPod when using a newer version), scrolling to the left produced the visual bug, but scrolling to the right didn't do anything at all
And yes, it does seem to be scrolling the opposite way of what other programs do.