I'm not sure why, but my 4.2 3ds in cfw cannot use the local multiplayer option in any games with download play(Not the download play feature, just local multiplayer in general). Other games with local multiplayer and no download play option work fine though.
Games like mario kart 7, mario open tennis, kirby's triple deluxe, and yoshi's new island will allow me to enter local multiplayer, but it will not connect and will freeze upon exiting(pressing b to go back to main menu).
I have deleted everything, formatted my sd card, and reinstalled cfw, but the problem still persists.
I've already asked this question in 3ds noob paradise, but I haven't received a response.
Edit:
Using Palantine Cfw with bigbluemenu
fully working cias