Or at least clearer what you are doing.
Ok, From the start, I will assume you are refering to the FIRST diagram shown at:
That being the case, here we go:
1) You are picking up the neutral (white wire) from the first box that has the 2-way switch in it, and running it up to the light you want to control with (2) 3-way switches. That white wire then connects to the neutral side of that fixture and STOPS there.
2) You are picking up power with a pigtail from the hot side of the 2-way switch. This hot wire (black) should then run directly to the 1st 3-way switch, and be connected to the end of that first 3-way switch that has only ONE (1) terminal. On the other end of that 1st 3-way switch are (2) terminals. You need to run (2) black or (1) black and (1) red wire from each of those terminals and have those (2)wires run DIRECTLY to the 2nd 3-way switch.
Then connect those (2) wires to the end of the 2nd 3-way switch that has the TWO terminals. (one wire to each terminal)
3) On the other end of the 2nd 3-way switch is the ONE terminal. Run a wire (black or red) from that terminal back to the light you want controlled by the two 3-way switches. Connect that wire to the hot side of the light. This wire then STOPS there.
The above will work. Trace all your wires and make sure you have done exactly as explained.
Things to look out for:
Make sure you wire the 3-way switches correctly. Wire to the END that has the single terminal and two terminals, NOT the SIDE that has the single or two terminals.
Make sure the wires in your 2-way switch box are truely power and neutral, not power, and a white wire being used to loop power back up to the first light. If that is the case, then you need to get neutral from the first 2-way light, not from the 2-way switch box.
Hope This Helps!