Microsoft Access 2003 sharing database

Hi,

I have some users having problems with a shared Access database. Most users have RO access and 3 have RW access. If a user opens the database with RO access and then a user with RW access opens the database it is only opened as RO access. However a .ldb file is created. If noone has the database open the RW user can open with read-write. I've tried moving the database to a local drive and I still have the same problem. Could someone please help?

Alicia