I have three nest thermostats installed my house, one per level. I use a VERA 3 with UI7. When I upgraded to UI7 and installed WWN app two of the thermostats seem to work properly. The third one appears as a device but does not function with VERA 3. It does not show temperatures, does not respond to mode or temperature change requests through the VERA controller. I have removed and re-installed thermostats and WWN app multiple times but to no avail. The level three thermostats fails to respond or register temperatures. Does anyone have any suggestions for a solution?
Write to support. I had a similar problem and they fixed it remotely. I suspect they upgraded the Plugin for me.
Make sure all three of your Nests have location assignments in Nest’s configuration (use their web app). I had one thermostat with no location assigned, and it caused version 1.116 of the plugin to crash. I reported the problem to Vera, and they downgraded my plugin 1.109. 
I’m not sure if the actual problem was understood by them and made it back to developers. The support rep was evasive when I pressed him on it.