Well my 4.0 Wii runs DK Returns with no modifications to ios's from both Neogama and CFG-USB loader.
What are you running your Wii at? Has your USB loader always worked or is this a new set up?
I have my USB loaders master settings to 002# error fix always on and forced my NTSC TV settings.
Maybe you just need to update your loader and set your global setting accordingly.