Thanks to everyone who helped me figure out this one ;) For those of you who are die-hard Naruto fans like myself, having the game freeze mid-mission whenever you reach an explosive trap can be absolutely maddening. I was contemplating exchanging my game in for a new one considering that the disk had no scratches or flaws. Apparently downloading Shikamaru causes some serious flaw in the game. I deleted him along with the Japanese Voices and so far so good, everything seems back to normal.So much for free add-ons. I haven't heard about any problems regarding downloading Jirayia and Sarutobi but I'm not going to risk it for 500 points.