When I change the color scheme and click Apply, I see a popup with checkboxes for Editor, Interface and Widgets. I was checking all three, but then, when I would click OK, and then Apply, I would briefly see that small Editor / Interface / Widgets popup appear, for a split second, and the Widgets checkbox was not checked, and then that small popup would disappear and then the changes would apply.
Take this with a grain of salt. That's what I think I was seeing, if I remember right.
Now when I click OK in that "Apply to" window, and then click Apply in the bigger popup, I still see the "Apply to" window flash open for a split second then disappear, but now the Widgets box remains checked.