I have also recently run into issues.. I was just wondering if you ever figured anything out. I am using a WIIU. All apps etc. are on sd card. Only wbfs and games folder with wii and gc games on vWii HDD (FAT32 format). The only way I can get usbloadergx to load wii games is if it is plugged into the rear top usb port of the WIIU. If I plug it in any other port, it will display the games but black screen freeze or black screen back to WII system menu when trying to launch WII games. I also have a...
I also notice a more up to date mirror on github here: https://github.com/gideontong/USBLoaderGX
There does seem to be some kind of github repo that exists but it specifically states its not official and directs folks to this sourceforge repo.. https://github.com/cyan06/usbloadergx It would be nice if they just migrated to github. Its much more modern IMO..