I had the same problem.
I deleted the (child) sensors, in order to recreate them with the latest version (2.0)
When I tried to include them again they where not found.
I found in the log (http://<vera-ip>/cgi-bin/cmh/log.sh?Device=LuaUPnP) that the devices where still there.
In ALTUI I found the devices, removed them from there.
After that I could include the sensors again.
I am on a new Vera Plus 1.7.2138
