> procedure TForm1.Button1Click(Sender: TObject);
> begin
> IB_Query1.Open; //Opens the dataset
> IB_Transaction1.Commit; //Closes and reopens the dataset?
> end;

The reason I suspect IB_Query1 to be reopened is this setting:

> object IB_Query1: TIB_Query
> CommitAction = caRefresh
> end

Note that I have never used CommitAction myself.

HTH,
Set