I just upgraded the 4GB SD card that came with my 3DSXL to a 32GB micro SD (in a SD converter), so that I'll have room to get Smash Bros digitally when it comes out.
The data transfer was easy and all my games still seem to work and maintain their save files, but when I run the Smash Bros demo it says my save data is corrupt and that it's making a new save file. It does this every time I relaunch the demo and it didn't do it before I upgraded my SD card (as far as I can recall). I tried deleting and re-downloading the demo including the save file, but that didn't help.
Since there isn't much of a reason to save data in the demo, I'm not super bothered by this, but I am worried about it possibly being a problem with the actual game when it comes out, or with other 3DS games I have.
Anyone know what's up?