The problem of leakage is certainly not limited to this stuff. Back when I was making PC boards, I made some boards for a company, and they told me they were no good. So I took a trip up to their place (very nice nice, a couple of hundred yards from the Pacific Ocean.) These were high impedance circuits, and IIRC most didn't work. I had already made *sure* the boards were clean when they were sent since this was a new customer and the second time it happend. Some of you already know the answer by now ... the salty air from the Paficic created the problem.