Update-
I thought there might be a bug but it was just coincidence, I think. Anyway, I deleted my select input mapping and reassigned a different key but it didn't take for some reason. Which means I couldn't select anything on the menu, so I had to kill the task. When I ran AM again, I still couldn't select anything on the menu because the Return wasn't mapped or working. So, I checked my attract.cfg and put the right key I wanted to map for select and it worked fine. I then deleted my input again and was able to delete and reassign a key without any problem. There was definitely a glitch but something that I can't reproduce now. I will put this in the odd but working category.