The system (RT Systems programmer with RT Systems software) works well. There are too many variables in cable design for the guarantee to extend to every cable. Performance of the programming system is guaranteed only with the RT Systems cable.
there are just too many cables out there for us to begin to know what you have.
Consider this as you decide which cable will be best for you. USB cables have become a little more consistent and reliable. The RT Systems programmers now work with "generic" USB cables.