I am relatively experienced amateur electrician (wired my basement, new ceiling switches etc), but this has me completely stumpted. I'm sure it's something simple, but I cannot work it out.
I have the same situation with 2 4-way circuits located next to each other. They were both existing circuits, and all I was doing was replacing the wall switches on each circuit (for decorative purposes). It is remotely possible that I mixed a wire somewhere, but I don't think so. I was careful when I removed and replaced the wires, doing one switch at a time.
On both circuits, there are three switches. Each circuit controls a single light (but different from each other). On each circuit, all three switches will swtich their respective light on and off ok.
However, also in both cases, once you switch the light off at one switch, you have to switch it back on at that switch before the other 2 will work.
Any help is greatly appreciated. I would prefer not to call in a professional if it is something simple. Thanks.