I have two input keyboard layouts English and Greek.
Sometimes after I change once or twice and usually when I try to put a password for authentication purposes, I put on the password, it returns false and when I check the Language sign on upper right side, the sign is totally empty without any 'en' or 'gr' totally blank(only the arrow next to it appears.
When I hit the buttons I've set for the language switch both languages come back again, it's like when in idle or energy save mode that it loses it again.