Hi, Just wondering if anybody has had this experience. Cbus network has been running for a few months now. Everything has been fine, but I noticed the other day that one of my 4 Gang Saturn switches no longer functioned. I'll clarify that, as it seems only not to be able to invoke a response on the Cbus network. In toolkit, I can ping it, I can see that it has 26 Volts, I can see that all the buttons are setup to do as they are supposed to. If I select the "nightlight" option in toolkit, the led on the saturn reflects this change. Also if I switch the Group Address on from another switch the faulty saturn switch registers that the group address is on (because the appropriate button led lights up on the faulty switch). But if I press the faulty switches button - nothing happens, the led doesnt come on, nor does the group address turn on. I also cant see anything in the application log when I press the button. Any ideas? I think i'm running a mix of firmware 1.5 and 1.6 saturn switches if that makes any difference and the faulty switch is 1.5.