Hacking can't load GC games (disc or USB drive)

[deesto]

Before updating WiiFlow a few months ago, I was able to load backup GC discs with Backup Loader (through the Homebrew Channel). Since the WiiFlow update, discs no longer load, and I've been fighting with the Wii to get that ability back, and/or load GC games from a new FAT 32 USB partition I created alongside an NTFS partition for WBFS files. WiiFlow can read both partitions and has no problem loading Wii games, and can "see" the GC files but goes into a black screen on launching them.

I've tried stephaniie's tutorial and also installed Abz's WiiFlow Masterpiece pack, but neither one helped, and I'm back to the same place as before. I'm pretty sure I have the required IOSs and such installed, but I must be missing something? Any ideas what?