Using the latest version of USB Loader GX certain games just won't load. I get only a black screen when attempting to load PAL versions of the following on my NTSC 4.2u Wii.

Big Brain Academy
Tetris Party
Tom Clancy's Hawx

I have USB loader set to Force NTSC but that doesnt seem to do anything. I was able to test a NTSC version of Tetris Party and that worked with no issues. So my question is why do some PAL games work but other don't? Thanks.