Club Penguin DS issue

Is it just me or is there an issue with the NDS Club Penguin game? I have tried different ones and none seem to work in my sons R4 card. They download and go onto the card without an issue but will not start up. If anyone has a fix for this probelm could you let me know?
Thanks
Mark

Make sure you have read the Common Issues https://www.romulation.org/forum/index.php?topic=1462.0