OK, not sure if highlight motion was the cause. Removing it seems to have reduced the frequency of green screens, but I still get a few. While it is still possible that I may have overlooked turning it off for one or more cameras I am looking for other causes. One recurring event was when my Logitech cameras were moving in and out of IR in the early am and pm. This is not unique to
Blue Iris. The Logitech software reports motion at such times, however, without the green screen. Will report more at a later time. Still learning this new software.