Thanks for your help I'll give it a go, by the way on the game that kick me back to homebrew don't show a banner/cover art just a black screen however the other ones do. I'm not sure if this is any help in identifying the problem but I'll try and build an ISO regardless.
EDIT: Just realised you...
As the title states I have a few games on my HDD, every game boots and plays fine on WiiFlow but on USB loader only a few boot. The rest just kicks me back to the homebrew menu.
The reason I'm not just using WiiFlow is because I need Usb Loader to run Project M for SSBB. Im stumped on what the...