Try wiiflow it's much better! Get it here
1 User Says Thank You bmarlo For This Useful Post
You should try wiiflow! make sure to have ios249 installer to install cIOS38_rev17, then wiiflow. MUCH less buggy than USBLoader GX.
This information was given to me from :Bmarlo: Its hasn't crashed yet and I am finally able to load ALL my ISO's NP!!!
I use both of theese USB Loaders and never have they failed .
I do prefer the USB Loader GX over the Wii Flow , But to all their own .
Hope you get it working , Kudos.