I am having a similar issue except it seems entirely tied to Nintendon't as I am using US isos. I cannot get a single inject, including an injection of Nintendon't itself(Forwarder), to load from the Wii u menu screen. In vWii it loads perfectly fine and if i got into the vwii menu, load nintendon't, and then go back to the Wii u menu and load the injects they will work. But at that point, It seems easier to just load the Gamecube games from the SD card and forget being able to use the gamepad for GC games.
However, I really love the convenience of booting into the Wii U menu and being able to load any consoles games. I have injections working of basically any other console, Wii, N64, DS, etc. The only one I cannot get to work is Gamecube and I assume its some issue with Nintendon't crashing when it loads.
I have tried:
Installing multiple versions of Nintendon't (including the most recent build downloaded from github manually)
Using the forwarder from WiiUSBHelper (with the Boot.dol they link to in the application)
Injections from Teconmoon's, WiiUSBHelper, and UWUVCI AIO
I have verified the ISO's and tried them both trimmed and untrimmed
I have tried multiple games to make sure it wasn't just an issue with that one title
I don't have any USB controllers plugged in, I am only using the gamepad in these tests
The only shortcut I've found to loading it first is using Wiiu2Hbc launching into nintendon't directly through the .txt file. But it doesn't offer gamepad support so I still need to use the Wiimote to exit back out to the Wii U menu.
Does anyone have any insight as to why this could be happening? Am I just doomed to have to load Nintendont games through vWii and go back to the Wii U menu to play on the gamepad? I realize this isn't the worst thing to have to do, It's just an annoyance really. But I've been obsessively trying to find a fix for days with no luck which makes my lizard brain want to smash it with a rock. Anyways, does anyone have any thoughts on the issue?