Some gnome applications (usual ones: gedit, gnome-calculator) can suddenly get looking incorrect (transparent background, visual artifacts, etc).
The reason could be a change in:
- Settings => Region & Language => Manage Installed Languages => Keyboard input method system
- Language Support => Keyboard input method system
- reboot
The reason could be a change in:
- Settings => Region & Language => Manage Installed Languages => Keyboard input method system
- Language Support => Keyboard input method system
Solution:
- remove ~/.xinputrc- reboot
