Every once in a while my lock screen suddenly requires me to press ctrl+alt+del in order to bring up the password screen. Normally pressing any key will do just fine but nothing seems to work.
This isn't like the regular "Please press CTRL+ALT+DEL to log on" message, the lock screen looks like it always does; A Bing wallpaper and a clock. My media keys (pause, play, next, prev etc.) still work and show Spotify changing songs.
Is there a feature that causes this behavior? A reboot gets rid of it but I'd rather not have it show up at all.