For the last fifteen years, you had a choice on sign-in screen of which user. Now, only I, the administrator shows up. For other users, they have to click a small button to see all users. I would like to always Show "All Users" and none of the online workarounds seem to work. The registry edit changing an item from 0 to 1 works, but only once. This is nuts. No online fixes or enable or anything else works.

Hi,

Have you taken ownership of this registry key and changed it to check the results? If not, please try to take ownership, change the registry key and then restart to see whats going on.

How to "Take Ownership" of a File, Folder, Drive, or Registry Key in Windows 8

http://www.eightforums.com/tutorials/2808-take-ownership-file-folder-drive-registry-key-windows-8-a.html

Please get back to use if the issue still persists.