Make sure that your joysticks are centered when you hit anything.  If their off center by just a little bit it causes you to not be able to hit any buttons. Hope this helps=]

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SpartanKing55:1 Vultures
2 Elites
2 Master Chief

ImAllhere:i can just guess what they were doing together...
cough*surprise buttsecks*cough

Subject three most made units