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I have installed the Arc-Dark theme and set it to be my GTK+ theme, but for some reason it is not being recognized by some GTK+ 3 applications.

Running gtk-demo the theme is picked up (so GTK+ 2 works).

Running firefox the theme is picked up (so sometimes GTK+ 3 works).

Running gtk3-demo the theme is not picked up (so GTK+ 3 does not always work). This also happens with other applications such as evince.

When running GTK_THEME=Arc-Dark gtk3-demo the theme is picked up (so explicitly setting the theme works).

I use lxappearance to set my GTK+ theme.

~/.gtkrc-2.0

# DO NOT EDIT! This file will be overwritten by LXAppearance.
# Any customization should be done in ~/.gtkrc-2.0.mine instead.

include "/home/carloabelli/.gtkrc-2.0.mine"
gtk-theme-name="Arc-Dark"
gtk-icon-theme-name="Adwaita"
gtk-font-name="Cantarell 11"
gtk-cursor-theme-name="Adwaita"
gtk-cursor-theme-size=0
gtk-toolbar-style=GTK_TOOLBAR_BOTH
gtk-toolbar-icon-size=GTK_ICON_SIZE_LARGE_TOOLBAR
gtk-button-images=1
gtk-menu-images=1
gtk-enable-event-sounds=1
gtk-enable-input-feedback-sounds=1
gtk-xft-antialias=1
gtk-xft-hinting=1
gtk-xft-hintstyle="hintfull"

.config/gtk-3.0/settings.ini

[Settings]
gtk-theme-name=Arc-Dark
gtk-icon-theme-name=Adwaita
gtk-font-name=Cantarell 11
gtk-cursor-theme-name=Adwaita
gtk-cursor-theme-size=0
gtk-toolbar-style=GTK_TOOLBAR_BOTH
gtk-toolbar-icon-size=GTK_ICON_SIZE_LARGE_TOOLBAR
gtk-button-images=1
gtk-menu-images=1
gtk-enable-event-sounds=1
gtk-enable-input-feedback-sounds=1
gtk-xft-antialias=1
gtk-xft-hinting=1
gtk-xft-hintstyle=hintfull

GTK+ 3 version: 3.22.30. Arc-Dark version: 20180715.

What is causing some GTK+ 3 applications not to use the Arc-Dark theme?

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