Mine is also the same as yours SamIAm. I just tested it out on my RGB modded Duo R, and it has the same problem as yours. Funny enough the save file shows up on my duo r, but on the game it keeps telling me there is no game. When playing the game, however, it is able to load if you are currently on the game. The moment you turn it off it just doesn't recognize the save file.
*Update As typing*
I erased all my save data like you Sam, and it finally worked for me too. Luckily, it wasn't anything too important, but kind of sux that it was the only means to be able to play it