Tried the

Use DBName

exec sp_change_users_login 'update_one', 'ATM' and got this error:

Msg 15600, Level 15, State 1, Procedure sp_change_users_login, Line 98

An invalid parameter or option was specified for procedure 'sys.sp_change_users_login'.

Then I...

Yes, the IT manager here recently copied the database from one server to this one. I'll go ahead and try what you've suggested and hope that works on this side....

My apologies. I found my answer. I saw a new feature in SQL Server 2012 called AlwaysOn and thought that this feature was trying to fix the table...