I clicked the Update Now button (Setup > Administration > Update emonPi > Update Now) and after the emonPi completed the update, its power, VRMS, etc. values stopped updating.
I found an error in the emonhub.log - something was parsed incorrectly and the problem was in line 191 (sorry no image). I found a [] that was in need of a line feed or two.
After I added the line feed I had to do a
sudo reboot the get things running again.
Release - emonSD-03May16
Update run on 19 May 2016 at 02:49:38 UTC