I had the same problem with wiijunkies. Wiijunkies does not work anymore. So you can use wii patcher instead, this program is written in java so it will work will any OS. Try it! Works for me. I have OS X Leopard by the way.
When I use the two of those programs - WiiPatcher to remove any patches, and WiigionFree to change from PAL to NTSC-U, the video isn't right. I start it up using Gecko Region Free and it goes to the warning screen with the remote, but the screen is in black and white, and is scrolling up (or down). I can't see the video clearly, and I don't get sound. When I try to boot directly from the menu, the game just hangs.