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I don't have an H2O, but if I'm not mistaken the touch system is infrared, which means a bezel around the screen where crumbs, dust bunnies and other such monsters can lurk. You might try getting a soft brush and gently brush under the bezel, or use canned air and give it a good air cleaning under the bezel around the screen and see if that might not be the problem why you can't change that box.
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