4.2 disabled region free on all mod chips. You need to either downgrade to 4.1, softmod your wii or wait patiently for someone to come up with a chip or firmware that fixes the issue
CopyDisc, if you're looking for information on how to downgrade, I used the tutorial found at this youtube (download this[Only Registered Members May View Links| Click here to register] for all the files you need to do it)
Just substitute any parts that require you to pick 4.2u to 4.2e, should work fine.
If you downgrade to 3.2 and don't update your system files some games won't work, but there's ways to get around that. Follow [Only Registered Members May View Links| Click here to register] and make sure to replace any reference to any US files to EU files, and you will be running 3.2 and all games will work. This is the guide I used and I have no problems with any game.