I see, I thought you have 1.4.2u (which does not have 1N4148 but a 5.1V zener diode instead).
Anyways, it looks like you have the 1.4u. Is your PCB showing July 2012 as the date or Oct 2012? D4 only appears on July 2012 PCB. I grayed that part of the instructions out because I assumed anyone who has bought the July 2012 batch would have finished building the circuit by now.