this exact same thing happened to me when I swapped cables, turns out I did have the cable offset by one pin on one of the connections, double, triple, quadruple check it.

eli
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Empeg 50gig MkIIa (stolen :'(, my baby) In an Impreza 2.5 RS-T -also (new additions to the family)- Empeg 10gig MkIIa Empeg 50gig MkIIa