Not all users are displayed for log on after a reboot or startup...

Problem summary: Not all users are displayed for log on after a reboot or startup...

This problem only occurs after a fresh start-up or restart. The only users displayed are the initial (admin user) and "Guest". Two other (non-admin) users are not shown for log on.

To work around this problem and get them to log on we have to log on as the admin user, then we can see the other users in the Fast User Switching menu (top right-hand corner of the screen), listed under the current logged on user. After selecting the non-admin user we can log in and use the laptop as normal.

If we lock the screen, use fast user switching or log out all users; all users are available for log in, until a reboot is done; at which point the non-admin users disappear again and we have to log in as the admin user and use fast user switching again.

The laptops are both brand new MacBook Airs. The initial configuration of Mac OS X Yosemite was done using the Apple ID of the purchaser (parent) and then the OS was patched, immediately, through the App store (no further updates available as of the date of this posting). After this Family Sharing was activated and new users set up for the two children who will be using these laptops.

Has anybody else experienced this problem with Yosemite?

Cheers,

David.