NBA JAM not working..

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I encountered a problem while playing NBA JAM . I was playing it earlier and all was fine.. I was stuck on it for 2 hours lol. Stopped playing and what not. I opened it up trying to get a game in.. but now the joystick acts funny.. when I'm making it go one way it shows.. but goes back to the center position as if I'm not dragging it.. any ideas ?
I'm on zips ICS

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Try going to "Applications" in your Settings, and 'Clear Cache' ....

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