I've never used USB Loader GX before, so I may have made a mistake, but I don't think so.
I just went through the tutorial, using the new USBLoaderGX2.0 and USB Loader GX-UNEO_Forwarder_2.0.wad files in the first post.
When I ran the boot.dol through the homebrew channel, USB Loader GX worked fine, I could play games perfectly. I then used WAD Manager 1.7 to install the forwarder, but whenever I try to open it I get stuck on a black screen, similar to wild-shark.
If I should be using a different WAD Manager version, or the .wad file is broken, or if you know of any reason why it's not working or where I could have gone wrong, please let me know. It would be very appreciated.