A spot on the "bottom" (by the home button) of my Touch screen that doesn't work without very firm pressure. It's obviously when you swap jewels right after that area the difference. I think there is a dead spot - i could NOT swap anything once last saturday. you know, while sitting at the genius bar.... alone with no one to see. So now to figure out if there is a way to easily repeat it - other than playing bejeweled for a long time!