The v0.3.109.20181207 update introduces a known bug as a trade-off for restoring access to the dashboard for a growing group of webCoRE users. You will see the following until this workaround can be removed:
For the past few months, the SmartThings platform has experienced degraded performance in retrieving device information. Users with a large number of devices (generally > 100) experienced recurring errors when loading the dashboard – the more devices the more often the dashboard failed to load. This is caused by a timeout in the SmartThings platform when attempting to load information for the devices associated with webCoRE.
The v0.3.109.20181207 update abandons the loading of current attribute values. You will not see temperatures, presence, lock status, or other current values while editing a piston and most numeric values will display as
NaN as shown above. While the piston editor needs to know which devices you have and which attributes they provide, the current values were only used for this side column in the editor. This will not affect the execution of pistons or the display of tiles and piston state – it’s purely reducing the amount of data loaded when you browse the web dashboard and mobile app.
This topic was written to preempt similar reports, please redirect any similar reports with a link to this topic.