New Windows builds break dark f.lux settings

I updated to Windows 10 1703 (Creators Update) yesterday, and tonight I noticed that my screen suddenly increased in brightness sometime after sunset. I use f.lux (which is great) to alter the color temperature of the screen at night. When I first installed it, it needed administrative permission to unlock the very low color temperatures, like Dim Incandescent, my preferred night level. Looking in the color temperature menu, I saw that the low levels were grayed out once again; it needed my permission to unlock them. Evidently, something about the Windows update process undoes the administrative action that allows the use of extreme color temperatures.