OK, I now know what happened, but others may learn from my confusion. I installed Toolkit 1.10.7, no problems. I then decided to try it out on a network that had worked perfectly for two years. Hooked up to the network via a PCI and scanned the network. All looked OK. Closed the network and removed the PCI then immediately walked a couple of paces to the nearest Neo and pushed a button - DEAD!! No LED on the button, no light operating. Now in a cold sweat. Pushed another button - same result, pushed a third button - same again. Panic!!! Pushed a fourth button - all OK!! Pushed the first three buttons again - all working!?!? Totally confused. I had never experienced this behaviour before so rang Tech Support. After going over the steps that I took, the conclusion was that the PCI contained a burden and a clock. When I removed the PCI from the network and quickly pushed a Neo button, the network was still adjusting to the loss of a burden and a clock. If I had been a bit slower I wouldn't have experienced the problem. Does this mean we all need to slow down a bit :)