Hi There, I know this has been answered before, but I have an issues.

I'm wiring 4 pot lights, renovation.

Here's what I have.

4 Potlights. (with three wires between 4, 3, 2, 1) Power comes to the potlight 4, 3, 2, and goes to Potlight 1. At potlight 1, the two three way switches (on 3 wires) join. I can't get this to work.

A drawing would be grand. Thanks.

The way you wired it will not work unless you ran 3-wire (such as 14/3) between the lights. Even then it is a much more complicated way to wire this.
The simplest way to wire this is the run 2-wire cable between the lights, and 3-wire between the switches, with the power at one of the switches and the switch leg to the lights from the other switch.
If you cannot re-wire this way then you will have to re-wire to run 3-wire cable between the lights. Then you have to be a bit clearer as to which cables go to where. Hopefully someone will then draw you a diagram, if you cannot find one already existing somewhere.