By powering off, do you mean you press the power button on your primary monitor? Please note that pinning only works in case the number of monitors are constant. If you pin your SensorPanel to display #2, and display #1 (primary monitor) vanishes from the list of monitors as managed by Windows, the whole concept stops working. We've designed the pinning feature to mitigate issues rising from changing primary monitor resolution as well as relations between the primary and secondary displays (e.g. when displays are moved around). It's not been prepared to be aware of display #2 (secondary display) becoming display #1 (primary display) because of the main (primary) display suddenly disappearing from the system...