> the statement is "Select * from tblUtenti" a very simple Select,
> and I try also with the field name instead of "*" but it's the
> same!

Sorry, no idea. In previous case I tried statements that were causing
problems on my computer and everything was fine.

> At the moment I don't have isql and I can't try do this.

You should have. It is shipped with Firebird installation and is
located in bin/ directory.

Best regards,
Roman Rokytskyy