I'm running 4.7, so that could be it. 4.7 seemed to work OK, but I suppose there are a few commands that are incompatible. This must be one of them?

Thanks Helen

--- In firebird-support@yahoogroups.com, Helen Borrie <helebor@...> wrote:
>
> At 09:09 AM 1/04/2011, you wrote:
> >Ron schrieb am 21.03.2011 um 20:58 (-0000):
> > A program that was previously working under v1.5, started erroring
> > after I upgraded to v2.1x.
> >
> > I'm explicitly starting a transaction, but when I attempt to open a
> > dataset (using IB Objects), I get the error: "invalid transaction
> > handle (expecting explicit transaction start)".
> >
> > What might be causing this?
>
> Old IBO version? You need v.4.8.something with Fb 2.1.
>
> ./hb
>