I gave my fiancee one of my promo codes, and the demo downloads just fine, but when you open it, it just goes to a black screen and the whole system freezes. You have to completely power it down.
I tried deleting it and redownloading it (repeatedly), to no avail. To see if it was the SD card, I moved her data to a new SD card, then downloaded the demo again. Same problem.
As another test, I downloaded some other demos (Bravely Default, Cooking Mama, Marvel), and those played just fine.
So now I'm out of ideas. Anyone else having this problem?