To FaTaL_ErRoR:
Yes, my drive is indeed seen in wiiflow. It even lists all the Wii games on it for me to select and load. However, after choosing the game the white loading bar that normally appears is completely missing and I'm stuck on a black screen until I power cycle the console. Also, I always plug my USB drives into port 0. I might try and move my apps to an SD Card and see how that goes, although I really would like to have apps and games in one place. Will also try using port 1 instead of port 0 and see if that makes any difference. The USB drives I use seem to be alright. Other USB loaders load Wii games just fine from them. Also I think there were two instances of black wiis. The family edition, which has no GameCube ports and was released in 2013 / 2014 iirc, and another one which just got a new diskdrive in order to prevent backup loading from disk, but still has GameCube ports, that I bought in... was it 2011? Or maybe even 2009? I don't remember the exact year.
To AbdallahTerro:
Thanks again. I will try installing older / different versions of the d2x cIOS and also plugging my drives into port 1 instead of 0. With that, I think this thread can be closed since if things do not work even after trying all this, I will probably switch to another USB Loader which is already working fine for me.