Stepper motor goes in the direction it wants even though the software says up or down

Imagine this : you press the left arrow key, expecting the X axis to move left ... it does ... once in a while. If you repeat this often, the software registers a negative X but the motor turns either one way or the other ... randomly from each keypress. Anyone had that symptom before ?

When installing the control panel to the wood back plane, there was a spark ... I burned something ... I replaced the burned wire and I tried interchanging things to get that it was the driver that was not working properly *I though) ... now that I have a new driver, I discover that the problem persist ...

I have to check if I burned a DB25 card or the smoothstepper itself. I have to get my oscilloscope running ...

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Any ideas anyone ?

Mike quite perplexed at the randomness of the direction of the stepper motor ...