The power rating could be an issue. I’ve also recently found out that with the hub plugged in, I can’t hot swap controllers. Oddly enough, the joypad index seems to be arbitrarily linked to specific ports on my hub. I did finally get everything to work, but all four controllers must be plugged in when booting, and I ran joyconfig for indexes 0 – 4, but the first time it would only register three of my controllers. I had to reboot with the fourth controller in a different port, then it worked fine.