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

Dan,

   It's kind of hard to picture.You do need a common ground to the SX no matter how it is powered.  But I have seen weird instances where ground loop effects have occurred between devices plugged into an outlet.  It can put the grounds at slightly different potentials and do all sorts of weird stuff.  It is hard to see happening here, but I am not saying it is necessarily affecting the SX but perhaps the supply to the SX-Key, which is supposed to be generating the clock signal for the SX and it not at that point for whatever reason.

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