My Gamecube adapter doesn't work
If you have issues with your official Wii U GC adapter, try:
-Plugging in your adapter by only the black cable
-If you're using a Mayflash 4-Port Adapter, ensure it is set to Wii U mode before plugging it in.
-Closing all other programs such as Dolphin that take control of your adapter
-If you use Massive's GC adapter program, have the driver program open and click 'start' before launching Slap City
-Reloading all controllers/Reseting Direct Input in the Slap City Controllers Menu
-Enabling/Allowing all DInput controllers in Slap City from the Controllers Menu
-Simply restarting Slap City
If you're still having issues, try:
-Running Zadig again to replace your WUP-028's driver
-Connecting your adapter via a different USB port
-Disconnecting other USB devices
-Verifying that you have not installed Mayflash's own drivers. You will not need them.