> On the other Database server (DevDB) I am able to see the files on the OS as
> they are created and populated.

> One DB Server (DevDB) is running Firebird Classic Version 2.1.0 RC1

I don't remember, probably in 2.1.0 RC1 we have a bug and not call unlink() for temporary file where GTT's data is stored. You can query tracker for it ;)

BTW, i see zero reasons to have not latest version at Dev server (2.1.3 or even current snapshot of 2.1.4 in your case)

Regards,
Vlad