So I have done everything. I tried 2 different 500 boards, I tried an extender/repeater, I tried positioning the ISY in other locations. I tried every option/menu that is available, I tried using a minimote as an inclusion controller, did not work. I tried everything that UDI suggested. Bottom line is that the 500 board did not work no matter what I did. I was unable to add any Z-Wave devices that were not basically next to the ISY. It is impractical to move it around when switches are all over the house. I wasted a significant amount of time on this and some money as well. I ended up reverting to the 300 series board with a 5.1 release. It was a bit flaky, I guess because it is an RC, but in the end I was able to get everything added and working. All in all a pretty frustrating experience. I did end up with a cleaner setup in the end as I basically ended up wiping out all the non-Insteon stuff and it's always cleaner the second (i wish) time around. IMHO the 500 board is defective, at least from my experience. I get that UDI spent money getting it all certified and what not but if it does not work in the field it really does not matter. The only solution that they suggested that worked was to revert to the old board and run an earlier version.