I go in to edit the widget.css file and at the top of the screen it says: “Editing f2-tumblr-widget/css/widget.css (inactive)”
I agree it’s very strange. I think it is something in my theme and am sending this discussion thread to my developer.
The theme is LesPaul, available on ThemeForest.
Hopefully, we can collaborate and figure this out. Thanks again for your responsiveness. A five star rating awaits if we get this nailed down!