Have homebrew on my Wii U / vWii, tried to install a WAD (a japanese Virtual Console game, which I made region free with ShowMiiWads), it shows up as a channel in my vWii with the name and picture, but when I launch it, I just get a black screen, the wiimote desyncs, and the only way I can turn the system off is by pulling the plug.

Still reboots just fine after plugging it in, so it doesn't seem to have done permanent damage. But can someone please tell me how I can get this thing working?