Not sure where to report a BUG, so here I am.
Starry Night 7 on Windows 7
For a while I didn't see daylight bands in my graphs, no matter if it was ticked or not in the options.
After some fiddling around a figured out how to constantly reproduce the problem.
Open a new document, hide daylight (CTRL-D), click on "Save Current Options As Default" and restart Starry Night. From this point on I will not be able to see/toggle any daylight bands in the graph.
Only if I "Save Current Options As Default" with daylight on I will be able to toggle daylights in the graph.
Option:
file location: C:\Users\<username>\AppData\Local\Simulation Curriculum\Starry Night Prefs\Pro Plus
file name: Default Settings.sno
parameter: <SN_VALUE name="Background_ShowDaylight" value="Yes">