glad to hear it is resolved (although that was meant to be an indicator for the problems root . . . not a solution)
so thats weird but that would hint that the problem is specific to that game (or at least its manual) i would delete and reinstall it just for good measure
and just in case anyone else has this problem what exactly did you do simply open another gba cia? or did you open the manual within it as well?
What size is your SD card? if it's 128GB that's a known issue when it's cluster size is 32kb. You need to to use 64kb cluster size and that issue will go away. It won't make a noticeable difference on such a large card. The larger the SD card, the slower they're read/written by the console.