At 08:14 PM 27/06/2008, you wrote:

>The problem has returned.
>
>It previously disappeared after I rebooted my pc and started Delphi
>and then loaded my project. In this case there are no error messages
>upon loading the project.
>
>After saving the project, closing & reopening Delphi and reloading the
>project (without rebooting the pc) the problem reappears.
>
>The app compiles and runs OK regardless.

Have you looked in the firebird.log/interbase.log to see whether there's anything interesting there?

Helen