Main problem is not able to jog axis, or send commands that are received.

Worked previously under GRBL V0.8.4 & Candle V1.0.11 controllers, until crash at hard limits (no switches) & quick power off.
Also tried UGS Platform V2.0.0 with Java 8. Says "no support for kill alarm lock for this version."
None of the 3 controllers react to "kill the alarm lock" command $X, nor show settings with a $$ command.
Using GRBL V1.1F, Windows 7.
Arduino has green LED, & receiving 5 volts, & CNC shield gets12V.

What am I missing? Help appreciated.

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