I have a client using an mde created in 1999 by someone else, for which I don't have the original source. There is a workgroup file that accompanies the mde file. I have the user and password information required by the workgroup file. In 2004 the client requested changes. Without the source, I couldn't make the change to the mde file itself, so I wrote a small mdb that attaches tables and provides a form to fulfill the client's new requirements. I created a shortcut for the new mdb that includes the workgroup info, and for 2 years everything has worked fine. Suddenly, the client is getting permission errors whenever he attempts to access his data. He can open my tool mdb, but not the tables attached to it. As it works fine when re-installed on my desktop, I figured his copy of the workgroup file had been corrupted or overwritten. I sent him a replacement, but it didn't help. Any ideas on where the permission errors might be coming from would be greatly appreciated.