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I dont know if it applies to you or not, but I had issues with my breadboarded version ("alpha") that I couldn't lick until I transferred to solderboard ("beta"). Even then I had some trouble (but far less), and am working on a new LCD (and iDuino instead of Freeduino) for my now "production" version. It reminded me of my engineering school days where we would run into issues with old breadboards introducing too much capacitance into a high-frequency circuit.
I know its not much help, can anyone else chime in?
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