When MP3+G player is opened you are presented with options of what device to use, USB, SD etc so that you can locate the MP3+G files. Despite chosing USB it shows me the contents of the SD card. BTW they are not reversed, choosing SD also shows me the contents of the SD card as expected. All other homebrew applications, WiiMC for example access the usb without any problems.

Is there a config file I need to modify?

I've followed the same Homebrew install procedure as on other Wii's and MP3+G accesses the USB drive fine on those. It just seems as if this particular Wii (Red, European, the most modern of my Homebrew devices) prevents MP3+G player addressing the USB.

Any help greatly appreciated, thanks in advance.