more intermediate switch head scratching

[robskiing]

Sounds like your looking into this too deeply draw us a diagram of the switches and the wiring I'm pretty sure someone will come up with an answer

 

[Swicade]

I would hazard a guess that one of the 3-core cables at either 2way switch has got the common and strappers crossed over during connection.....resulting in the intermediate switch actualy switching 1 strapper and common instead of the 2 strappers.

 

[vjsmarwick]

Is the mains and the light wire either end or are they both at one end and just the live linked through the switches ? Someone mentioned a diagram it would be good as there are different ways to wire them and I am sure among us we can work it out.