"Could Not Lock File" Error

My company has a network with an Access application front end and an Oracle back end. The back end is read only. The folder in which the Access application resides is shared with other departments who have been concerned about people who use our application having any contact with their applications, whatever they may be. Everyone who used the Access application has had Full Control rights on the old folder.

Our application was moved to another folder which is in another folder to which no one has access. To get to it, the complete path must be typed in; the browser can't be used because the forbidden folder can't be opened.

Only a few users need Write access to the application. Everyone else has been given Read Only access to the folder in which the application resides.

We are now finding that when the second person tries to access the application in its new location (it was deleted from the old location), they get the "Could Not Lock File" error message and the applicattion won't open. The Access application has no security on it at all-everyone has full rights to do anything they want in it. At corporate's insistance, the only controls on who can do what are the permissions that are associated with the folder.

We are having a few of them apply for Read Write access to the folder to see if this solves the problem but it will be a few days before anyone gets the permissions changed.

In the meantime, does anyone have any idea if this is the problme or could it be something else? By the way, this only started happening in the last day or two but people have been requesting permission to the new location for about a month.