Hi Helen

> 1. Running the application on the same machine as the database
> server & database
>
>

Yes. It is our 'server application' and it runs on the same machine as
the DB & FB Server.

> 2. Connection via localhost with Protocol setting cpTCP_IP vs. the
> IP Server with empty Server property and Protocol cpLocal.
>
>

Connection is via TCP/IP and NOT by local host. It uses the machines
actual IP address.

> Your mention of XP Pro rang a bell. One of the Windows service packs
> (SP2?) broke the availability of additional local loopback ports and
> caused AVs with local apps using events....Microsoft put out a hotfix
> for it....it goes back some time but you should still be able to google it.
>
> Have you tested whether you get the problem with remote clients?
>
>

Not using Local loopback so it shouldn't be an issue. Also checked for
it and it seems I have all current updates.


Thanks for your suggestions

Rob