I used a multimeter to check directional pins on BOB. Also, checked 5V on the BOB and it indicated 2.82
Operating correctly:
(Z) 2.84, .56
(Y) 2.82, .88
(X) 2.62, .92
Here is what I got when Z+ worked, Z- no movement, Y+ and Y- moved toward Y- direction regardless of what key associated with Y axis was pressed, X- and X + moved to X- regardless of what key associated with X axis was pressed.
(Z) 2.63, .88
(Y) 2.63, .92
(X) 2.32, .92
When it isn't working correctly the malfunction is always the same as indicated above which may mean something. What is your take on the numbers? What else to check?