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Buttons used to give me problems too, the first time around. Instead of buying new ones, i salvaged them off old junk. For some reason, the first time using them on the guino, one or more of them were constantly "on", so when i would hit Left, it would think i hit Left+Right or Left+Middle or whatever, and do something crazy. Then i desoldered them, retested them a few times & hooked em back up, and never gave me a problem since.
My very first set was completely ruined, i think by too much heat from the soldering iron.
Have you tried feeding the vss pin 0v & 5v directly from the duino board itself?
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