I Modded my DC2v2 Wii with a D2Pro9 and Wii Clip. All originals work perfectly fine (including SSBB).
Backups of Mario Galaxy and Metroid Prime work
Backups of SSBB, MarioKart Wii and Mario Party 8 don't work.
All dvds burned at 4x (lowest I could) on Verbatim DVD+R set as DVD-ROM
These discs just make a clicking sound, then I get the error message