According to my research nute lock out can be caused by a few things -- I'm thinking I may have hit her with double of one or another of the GH 3 parts. I don't remember.
The only book I own on growing weed cost me 5 bucks at the hydro store when I bought the CFLs. I got it for half price because I bought the light. The author isn't identified, but says he opened his own Hydro store from profits from his grows. The info in this little book is pretty much the same as you fine folks have been telling me, but he has thisd to say about PH -- "For Ph to actually cause a problem in soil the garden would have to practically be abondened. The water would evaporate long before PH levels could fall far enough outside the acceptable range to be the problem..." He suggests over watering or over nuting.
"The infamouse "it's nutrient lockout caused by your PH" answer is the standard go to responce..."