In SX Microcontrollers, SX/B Compiler and SX-Key Tool, Coriolis wrote:

Wait wait wait, that is your problem. The SX-Key acts as your oscillator when plugged into the board, as such you SX-Key placement and use must conform with the requirements of oscillator placement. The suggested maximum length for an OSC line when actively driven @ 50MHz (as the SX-Key does) is less than 3", your length is _twice_ that! As such, the parasitic capacitance and inductance of your extra long leads messes with the slew rate attainable (and therefore the maximum clock rate achievable). If this occurs you will experience problems like you were having, even though your setup now works, setting the assembly down and picking it back up (ie leads are moved around) can cause the problems to reappear.

Peter's discussion is regarding the strain relief on the _serial_ side of your SX-Key (the end your computer is connected to), extension of the lines the way you are doing is strongly discouraged for the reasons listed above.

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