Hello Andrew.
Yes I’ve tried rebuilding lighting (on all qualities).
No the settings were not tried at the same time.
I’ve made a New Project and confirmed that what I’m doing is correct - it works in the new project.
I’ve made a new level in the problem project, and the Scene Color change is ignored. I think we can safely say that something in the problem project is broken, but I don’t know where to look.
Thanks for your help!