It has been confirmed by Wiinja that new Wii models using the D2B Panasonic chipset fail to run the Wiinja, CycloWiz and WiiKey modchips.
The modchips do run well in 1st generation Wii consoles, but it seems newer models purchased in late January / early February have been modified.
Both the CycloWiz and Wiinja teams have confirmed the problem, and are already working on new versions to get around the Panasonic chipset.
Currently the only way known to check what drive model you have, is to open your Wii and check the following chip on the DVD drives PCB. The version shown below - "GC2-D2B" is the incompatible drive model.