I SOLVED my problem by resetting the gtk color scheme:
dconf reset /org/gnome/desktop/interface/gtk-color-theme
Considering that the GUI to edit this setting is gone, this is an upgrade bug. The old setting should either be ignored or reset to its default value.
I SOLVED my problem by resetting the gtk color scheme:
dconf reset /org/gnome/ desktop/ interface/ gtk-color- theme
Considering that the GUI to edit this setting is gone, this is an upgrade bug. The old setting should either be ignored or reset to its default value.