I recently finished the main game of Etrian Odyssey (european version). When I tried to load my file (as the credits return you to the main menu after saving), it gave the message "Data loading failed. Turn the power OFF, and reinsert the DS card."
Just now, I tried Bowser's Inside Story, but that gave me a similar error just as I booted up the game for the first time on this device.
Despite those two games not working, I was able to load up Pokemon White 2 without incident.
What's going on? Do I have some configuration wrong somewhere? Did I get bad ROMs?