EDIT: Its fixed now. I reinstalled. I updated my EMUnand in order to play ACNL online. I thought everything was working perfectly after the upgrade. But when I added a cartridge to the 3DS it wasn't reading it. This is working with both retail cartridges and the gateway cartridge itself. I can get it to read retail cartridges by closing the 3DS, adding the cartridge and then opening it up again. But the Gateway card still doesn't work. All downloaded games are unaffected. Any advice?