Many of the newer Wii games are not working with USB Loader. There is however a great alternative loader that fixes all of these problems.
USB Loader GX – Not only does it work with nearly every Wii game it also allows you to change individual settings for loading each and every game on your USB drive.
Game covers, disk images and 3D covers are also supported and can be downloaded directly from within the USB Loader.
Get over to their website, download cIOS38 rev 13 install it, then install USB Loader GX and enjoy! http://usbloadergx.koureio.net/
Don’t forget if you find these tools useful give the authors a thank you or a small donation for all of their hard work and time.