Known issue. Posted about 100x in this thread alone 
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Issue with HTML being displayed on Android after the first viewing.
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Big giant paragraph in the last 3 releases of NST Manager when you open a device in Things for the first time stating Android Issue in big letters.
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The latest Beta release gives you access to this data via web browser from within NST Manager, instead of viewing the HTML Content in the device itself.
For Android, when you open the Device under things, simply swipe down on your screen and the content that can be displayed for the device will show at the top. To see the HTML data on tour Android, goto Settings/Apps/SmartThings/Clear Cache/Force Stop App. Go back into ST mobile app, open a device (TStat) and swipe down. You will see ALL data about the Thermostat, including the paragraph about Android and the HTML Content. After you exit things for that device, you will no longer see the content until you Force close the app again.
The fix is to either install the new beta version (you need to be able to know how to update repository to beta and update all code on your own), or to wait until the Beta is released into Production. Then you can access the HTML Content and graphs and extra goodies from within the NST Manager app where the urls can be used on their own.
