Okay.... I'm on my last switch to install. I've done 5 others. I thought I had this down pretty well. I am now doing a 4 way. I thought it would be the exact same as the 3 way. For some reason it's not working. One of the switches does nothing. The main switch with power coming in works perfectly. The other 2 do not. One of them turns the light off, but not on. The other doesn't do anything. I could have sworn it is wired right.