@Sharpzz I googled and nothing about the game being incompatible it's a US O3dsxl using a US rom of shin megami tensei IV, I got two freezes in naraku, once during a convo and the other during a battle as in the game froze. Couldn't go into home had to hard reset.
@Misledz I don't think I did unless the card wasn't all the way in? It did have a blinking flashing light and wouldn't let me change roms then it worked fine.
Also always remember to press the button once you're done playing the game, not just to cycle, but to make sure your saves are saved properly. Just a FYI. If you already know it then just ignore it

And yes the blinking light means that the button was pressed, the light never lights up unless the button is pressed.
If it blinks fast and rapidly, just eject it after 5 seconds, then back in and it should load the list fine, it's probably like some list building thing going on. But this only happens when you remove the SD card to add new games.
If you doubt your SD card is original, you should do a test with it over here.
http://mympx.org/Downloads/p13_sectionid/2/p13_fileid/13
Download that and check your SD card. Don't believe everything you order online or read unless this can vouch for it.
Also, Rule of thumb, always use a Class 10 SDHC MMC. There is a massive difference in write/read with Class 4 to Class 10