Change the lighting (cover the illuminance sensor by hand) at the time when you click on the 'Save Preferences' button so that the sleepy device wakes up and accepts the reporting parameters.
EDIT: Got it in there now. We'll see. Nice fine tuning features. Appreciate your efforts.
Not to burden this thread...but if I set the illumin reporting threshold to 50 should I be seeing this frequency in the Events stack? Something necessary to have it take effect?
50 is not a Lux unit, but some kind of relative number that can not be converted into Lux. Thats why the hint is 'bigger values will result in less frequent reporting'