There used to e an issue where Window's updates would kind of corrupt a dll file in the programmer that would cause that error. Usually, re-installing the programmer would fix it.
I still service half a dozen ZTDs, a couple ZTSs and a smattering of Omegas IIIs and IVs. They did in fact use the wht/or pair for T/R audio, with the wht/bl used as a bypass pair and wht/gn for DC voltage. I even have a 412 and one solitary 128, which I am proud to say, was recently converted from coal to regular house curent.
