Account just disappears...and accounts is no longer accessible from Sys Prf

Ok I have the strangest thing that I just can't figure out.
I have a computer that has 3 users on it. One admin and 2 student accounts.
For some reason, on many computers one of the Student account is just gone..it does not show up in the list for login options on the log in screen...however the "Student" folder is still in the Users folder.
And when I am in admin..and I click on system prefs>>>accounts there is nothing there..no options to add or delete users..nothing...the window is just a blank gray screen.
Help!

Did you change the email address or create a new Apple ID?
If the email address associated with the account was merely changed, sign out of the Apple ID on the devices and sign in using the new credentials.

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