> We have downloaded and are testing Firebird 2.1,
> it has some extremely important fixes to
> external file tables which are very good.
>
> However, It seems any time a person who has still
> got an old version of fbclient.dll (1.5) connects to it.
> The database corrupts.
>
> ie. "internal GDS consistency failure"

What in firebird.log ?

> Does anyone know anything about this?

Old client can't corrupt database

Regards,
Vlad