did you ever solve this problem? because i have a similar issue but instead the .xci files show up blank with an unknown publisher and says that the game card cannot be read if i try to start it. .nsp files have the same problem too.
in your case it's crap sd 100% sure. download the program h2restw and you will see your data is damaged after 8-16gb....
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I had the same issues (boot.dat not loaded, blank games) and I can confirm that, if the game does not load, it means your card is 100% fake, also if you buy it from Amazon resellers.
H2testw is a big proof of that.