Barry,
It may be a three beer problem, but usually it's because I just say something wrong (I'll take the beer though!).
If wires parallel each other they tend to affect each other more than if they were not parallel. Altering that 'parallelness'(?), and how close they are to each other, changes how much they can affect each other. Increasing it means more chance, decreasing it means less chance. So, if you twist one cable so that it changes it's physical relationship to the 'other' cable, that can be good. Running them 90 degrees from each other produces the most change. (And if you figure out how to do that, you are going to wire all of my boats!) Has to do with mutual inductance and capacitance (and if you think you've had a three beer experience before, get me talking about that!). Ain't electricity fun?
- 'Doc