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

Patient to doctor: "Whenever I press here, it hurts". Doctor to patient: "Then don't press there..." 

Hey, the resonator is operating at 50 MHz. Your finger adds enough load (resistance but also capacity) for such a high frequency to stop oscillation when you touch the SX-Key connector. When you remove the finger again, oscillation may or may not start again - at least, this is what I experienced myself. Increasing the SX-internal oscillator driver gain (HS3) may help but it is not for sure. So you better follow the doctor's advise :-) .

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