Came across another issue. When I created a tile for my location based on my cellphone, the tile icon became a question mark instead of the assigned icon.
This usually happens when a new presence device is not "primed". You might have to exit and re-enter your geofence area in order for the device to update it's value.
When presence sensor reports a value of NULL, SmartThings assumes that the device is "present", however we don't agree that this is a correct assumption. Once the device will report any real state, the question mark will be replaced with the state.
Customer support service by UserEcho