Sorry, I forget to add those details.
Surface Pro 3
Windows 10 (10586.494)
MSPoweruser App Version 3.0.1 (Build 30105.47)
I have changed the Live Tile size using small, wide and large but still cannot get the live tile to work.
I also have the app on Lumia 650 (W10 Mobile) and the live tile works perfectly on that.
Despite the above issue, I am loving the new app...great work!