Back-end file locked for second user

I have a split database.  The back-end file is on a server.  The front-end file is on every user's computer and is linked to the back-end.

 If user #1 has a record open via a form and user #2 tries to even open the database they get a message indicating that the BACKEND file is in use.  Then the main menu opens but they can't go to any record.

Why would this be happening?
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SteveL13Author Commented:
Another comment... I'm testing this in my own environment using an Office 2013 and an Office 2010 machine.  It is the Office 2010 machine that is giving me the message.  Not the other way around.
Every user needs crud permissions on the directory that holds the BE.  That is Create/Read/Update/Delete.  When Access opens, it creates a lock file named myapp.laccdb so if the user does not have Create permission, Access cannot create the lock file and so the first user will open the database in exclusive mode and block all other users.  The last user to close the Access BE will need Delete permission so that the lock file can be deleted.

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