Also, a little update for everyone who has been trying to help me. I woke up today and tried an SD card that I hadn't previously tried. I formatted it to be safe, and put 1 GameCube game on it. The game ran, and quit as it should! It went back to USB Loader GX, and I was able to select and load the game AGAIN with no freezing! I was very excited at this point, so I went back to the home menu and plugged my HDD in. I went back into USB Loader Gx and tried to launch a game that was on the HDD, it launched fine. When I quit though, it got stuck on "Initializing USB device" and eventually froze up. I unplugged my system and HDD and restarted. This time I went into the HBC and launched Nintendont through there. I was able to look at the settings and quit Ninendont without a lockup for the first time!
I'm assuming it must have been how my other 2 SD cards were formatted, and I don't think my Wii U likes my HDD either. I had an internally powered HDD that I used for my softmodded Wii, so I bought a Y cable and have been trying to use it for the vWii. Is it a better idea to just get an externally powered one for the vWii? Is there a list of "recommended HDD" for the vWii?
Again, I just wanted to update everyone, and hopefully the issue was either my HDD and SD card, or a combination of the two.
Thanks for all the responses and help I've received over the past 2 days. Hopefully this is the end of the headaches!
Hmm, maybe there's a hidden partition on the drive that's interfering? I don't see anything in your SysCheck that should be causing it.
I'm not that familiar with the Wii U but I would think it should work if it worked on your Wii. I know the Y-Cable is usually a must on the Wii U.