When was the last time you formatted your microSD? It might need a format. Make sure you backup al your files first.
If that doesn't work, I have absolutely no idea. Even if you did have an outdated YSmenu, the game should still load up fine, then lock-up on the file selection screen, as that was the AP block.
If that doesn't work, I have absolutely no idea. Even if you did have an outdated YSmenu, the game should still load up fine, then lock-up on the file selection screen, as that was the AP block.