Title says it all really, I'm using EmuNAND - just left with a black screen, the only option being to remove the power cable. Not sure if the issue's specific to USB Loader GX or if it's the same with other launchers...
*EDIT* Even pressing the off button on the Wii U still leads to the same black screen...
*EDIT* Even pressing the off button on the Wii U still leads to the same black screen...