Don't cross-post the same message in multiple parts of the forums. I deleted the other one.
If you have d2xv7's, your mod is old and updating to v8s or above may help. You can get v8's in Chapter 2 of the Softmod Any Wii guide linked in my sig.
According to this: http://www.wiihacks.com/other-faq-gu...solutions.html Just Dance 2 should be run using cIOS 224. Try JD4 using the same cIOS to see if that helps.