This quirk has been bugging me, and especially my non-techy partner. If either of us allows the system to auto-lock the system due to inactivity. We cannot access the dropdown to login as ourselves, we have to log back in as the original(last) user, log out then login as ourselves, then log in again as if we had locked the system.
Just to recap, because maybe it's not obvious.
'A' logs in and the system auto-locks due to inactivity. 'B' is able to log in and does so, system auto-locks due to inactivity. 'A' is unable to log in now. 'A' logs into system as 'B', logs 'B' out, then logs in as 'A', gets to the original login screen and eventually logs in as 'A'
phew...!