lost management access to a database

Unless you created a runtime solution and removed the admin access, it is my understanding that you have to have at least on account with full access.  A dialog window should pop up when modifying the [Full Access] account to read only and not allow it.  I would verify you are logging in with the correct credentials.

I'm not to familaiar with files on a a server, all of the projects I have made, or worked on have only been hosted by a standard pc and accessed remotely through the open remote.  I know I have made a few projects that I set up to automatically login by eneterint the credentials in the file oprions tab under File.  Then if I want to open with the Full access acount I hold the shift button, or I think options for mac, then double cklick to open and the password dialog box opens, to allow me to enter another accounts credentials.  I pesonally also have a password recovery program I have had to use for projects I have left on the back burner, and lost all info for and was able to get back in.

Hold down the shift (Windows) or Option (mac) key while opening the database. You should then see the standard password log in appear.

Then go to file options and modify the settings there that are automatically entering a password for you to open the database.