But now i think it's no longer appearing. After a reboot is applied but of course i think i changed a few things in the configuration editor to refresh it.
Other than that, there is one thing often happening to me. If i logged into my pc using thin client (LTSP). as a user (Let's say John), when i login with another pc also with the account "John", it gives me the following error:
Error activating XKB configuration.
Probably internal X server problem.