At 04:48 AM 25/05/2006, you wrote:

>We use Interbase Express and ADO Objects to connect. The firebird
>client we use is version 1.5.2.4.731, firebird embedded.
>
>This error most commonly occurs on startup of computer on both
>Windows XP and Windows 2000 Professional. Our app is tied to the
>windows system login.

OK, this simplifies things, I think. I suspect that you are getting
this error when attempting to run your application from the
IDE...right? You can't do it with Fb embedded. Delphi/BCPP already
has a connection in the IDE when you come to run the app: hey
presto! your app's instance of the embedded client can't get
exclusive access to the database--by design!

This is getting to be another of those things to "tattoo on the
forehead". Develop with the full server, deploy with embedded.

./heLen