After the last year of using a CNI for my work projects I have been forced to use a 5500PCU interface for testing my current job - not happy jan.. This is where it gets really annoying I have connected teh following 5500PCU, 8Channel Dimmer L5508D1a, a DLT and 2 neo 8 button switch's. Now one of the 8 Button Neos has a button that glows orange till pressed and then flickers orange/blue till pressed again, and both the DLT and the Dimmer refuse to fetch serial numbers and will not transfer between the DB and network and then give me errors when trying to update them something about not being able to transfer programming - i dont care as i want to program them with a new setup. I have the latest Toolkit software installed 1.10.1 and am running Vista Premium SP1 ( if that makes a difference) I have removed all switchs so its just the 5500PCU and Dimmer and tried all combinations of rj45 plugs and still have not been able to get this to work. According to the lights and the software i have comms between all items and cbus clock and burden is running ( software as i cant find my hardware one) So should i just purchase my own CNI (as i want one anyway as i prefer to use network for connection rather than usb) or try getting another Dimmer to see if the problems goes away before i stress out. Also one other question does it matter how the network is laid out for cbus components - CNI - DImmer - Dimmer- Switches or could it be setup like this CNI - Dimmer - Switch - Switch - Switch - Dimmer - Dimmer - Switch My current job install has items in 3 seperate areas of the house with cbus hardware (dimmer and relays) located in each area but joined on one run with switchs as above inbetween ( if that makes sense)