This is exactly the same issue I have, with the suggested solution not working.
Thank you 'PCR just PCR', appreciate the effort in your reply. Unfortunately, this has not resolved the problem.
I have three laptop PCs running Windows 10, Version 1709, Build 16299.192.
ALL three exhibit exactly the same behaviour.
A reminder of the problem:
If User A is logged in and does a normal 'Shutdown' from the start menu, the PC shuts down. When restarted and User B logs in, the start menu 'user' icon shows that 'User A logged on'. If User B tries to shutdown the PC, a dialogue box pops up to say 'other users are logged in, are you sure you want to shutdown, work may be lost' (or to that effect, you know the message!).
The 'Fast Startup' on/off made no difference to this issue I'm afraid.
"Why is this a problem?" several people have asked. It's a problem because my wife and I share a laptop and my children share a laptop. My children do not know each other's passwords, so cannot log in as each other, to then log out and shut down. OK, my wife and I can do this, but it's a pain and a waste of our time.
Work around? Yes, but again, it's a nuisance...
Every time you want to shut a PC down, you must first log off from the Start Menu. Get back to the main login screen, then click on the desktop until the Power button icon appears in the bottom right hand corner, then click shutdown. The PC then shuts down with nobody logged in.
What was wrong with the way it worked in Windows 7? I know Windows 10 is a new revision of code, but surely the 'shut down' feature didn't have to undergo this alteration? If this is a new feature, fine, I can see many people wanting it, but give us the option to toggle it on/off as per our individual circumstances.
How is this going to work in a corporate environment where a single laptop may be shared by many users?
Given that this is happening EVERY time on ALL three laptops, this is a designed feature, not a fault or error or intermittent issue. Just want to switch it off...