I'm on Kubuntu 16.04, with kde 5.6.5, and window background color is not applying (always the default white)
Here is a screenshot of Doplhin with the Breeze Dark theme, as you can see, some parts of the window stays to the default color. It happens on other applications too, like System Settings, and with other colors/themes.
I tried upgrading to kde 5.6.5 as someone said on Kubuntu Breeze-Dark not working as expected, nothing changed. I created a new user, as suggested on KDE Plasma 5 upgrade has removed my window decorations, but it didn't work.
Same problem as Kubuntu 16.04 Themes do not apply correctly?
Does anyone know how to fix that?