Thank you for the fast replies 8)
I am not convinced that the devices are still working. I have tried every sort of factory reset I can think of and they will not set up links with other Insteon hardware or with the Insteon software that worked fine with them before. I did hold the set button down for a long time, maybe they self-destructed as it would seem weird for the zbpserver software to do this. I have two new units on order so I may try the manual code entry method to add one of them when I get them. One thing I noticed is that the 2450 I/O link is not on the wheel of expected devices from the manual entry dialog, is this significant? Another question, is the Insteon 2413U PLM officially supported by the zbpserver?