Just check your config file ~/.config/gtk-3.0/settings.ini and if they are not set you can put there your preferred cursor theme and size with these values: gtk-cursor-theme-name=gtk-cursor-theme-size= Best regards, Josep ---Mensaje original--- Bad news.... After turning on the computer this evening, QT applications have white cursor and GTK applications black cursors. Something is broken in the GTK theming in KDE.