> I've just upgraded our internal database server from IB 5 to FB 1.5, and
> I had some trouble using the command-line gbak (it complained about the
> size being wrong or something like that), whereas using IBConsole worked
> fine.

I have too weak batteries in my crystal ball, so I can't see the parameters you used.

> I suppose there must have been some change in the syntax compared
> to IB 5 and IB 6. And ideas?

- look into documentation
- look at short help written when running gbak without parameters
- look here: http://www.volny.cz/iprenosil/interbase/gbak_switches.htm

Ivan