I'm so frustrated at this point, that I've given up and uninstalled the app.
I won't ask for my money back, as it's only $5, and I'm holding out hope that it will work fine at some point.
All the arcade stuff works fine in Retroarch, but I can't get any arcade games to work with Launchbox.
I tried at least 4 different arcade cores, which all work fine for me in Retroarch. And it didn't matter if I had the box checked to unzip the roms or not (mine are zipped).
At best, all I could get Launchbox to do was open Retroarch, which I can do myself already.