Was retested here with default TAdvColumnGrid on the form and the code:
procedure TForm1.Button1Click(Sender: TObject);
begin
AdvColumnGrid1.InsertRows(2,1);
Caption := IntToStr(AdvColumnGrid1.RowCount);
end;
procedure TForm1.Button2Click(Sender: TObject);
begin
AdvColumnGrid1.RemoveRows(2,1);
Caption := IntToStr(AdvColumnGrid1.RowCount);
end;
procedure TForm1.FormCreate(Sender: TObject);
begin
advcolumngrid1.LinearFill;
end;
and I could not see any problem.