i'm trying to beat the game on sick, and right now i'm in downtown. ive completed all of the master zen missions except for the last one with the stall, focus, and special. because he's not there by the dumpsters. there's no star, and i've completed every other mission except the green roof one. i've done all the sponsor challenges in holly, beverly, and downtown except the one involving stalls. i've also done all the bmx challeges and i have 400 dollars. anyone know why he won't appear where he should?