I can not connect my Nintendo 3DS to the new airport express, both Apple and Nintendo "customer service" blame each other, I just need to connect so I can update my firmware on the 3DS, any help is appreciated. Apple is becoming Microsoft!
Problem solved! The Apple tech and I tried setting the GUEST network security to the WEP2/WEP setting and it worked! I hope this helps the one other person who had this problem and anyone else who may encounter it in the future.