This is slightly different to this and other questions because 1. All my users have a password, and 2. I still get the user selection screen on boot up.
My problem is though, that the last used user is getting automatically (read: invisibly) logged in, in the background. This machine is used mostly for gaming and the automatically logged in user is hijacking Steam which is causing problems for the actual person logging in (when it’s my kids and they don’t know why their games aren’t launching).
I have tried the fixes mentioned in the linked question above, although I’ve only done the registry fix for a single user. Does it need to be done for all users?