[EricH]

Originally Posted by Ether

Follow Mike's advice about your wiring, even though you think it is "100% correct and pristine".

At the risk of getting another "Unnecessary Sarcasm Flag" thrown, I agree with this. This is CS101 Syndrome: "It's perfect, I did it!" Guess it applies to electrical as well... Get someone who isn't familiar with your wiring to examine it if you can. They'll be more able to find the problem easily than you are, because they don't think "Oh, that's normal" on something that might not be right.