Hello.
I am installing a Leviton PR180 and the diagram provided is not working for me. My belief is that it is because the load is located between switch 1 and the PR180, and not at the end, as shown in their diagram. That being said, I tried the following combinations with no results. Assuming Green is always tied to ground and Black is always common, I tried the jumper between black and red and between black and white on switch 1. For each, I tried the PR180 Red to the white wire and the Yellow/Red to the red wire. I also tried the PR180 Red to the red wire and the PR180 Yellow/Red to the white wire. None of these 4 scenarios worked. Some resulted in the PR180 working when the switch 1 was in only 1 position, while others prevented it from working at all.
Please advise! I tried calling Leviton and got a message that they were closed... no other times of operation, when to call back, or anything. Useless.

Update... after 5 hours of attempting to get this POS working, I give up and am going to return it. Since Leviton does not have customer support, I tried all possible wiring combinations at the PR180 and with the jumper at switch 1. I charted all combinations and stepped through them. Clearly, this device does not support 3-way where the load (fixture) is in the middle of two 3-way switches.