You could attempt alt+F2 then typing the command "r" this will restart gnome and reload the desktop which should resolve this. This isn't a permanent solution but it's certainly easier than locking and unlocking your session.
You could attempt alt+F2 then typing the command "r" this will restart gnome and reload the desktop which should resolve this. This isn't a permanent solution but it's certainly easier than locking and unlocking your session.