Indy - ftp problem

Hi, I have next problem, when I start upload some file using IdFTP
application is freezing - it starts to work after uploading file. I use
IdAntifreeze.
For example:

procedure start;
begin
timer1.interval:=1000;
timer1.enabled:=true;
....
mainform.IdFTP1.Put(ExtractFilePath(application.exename)+ 'data\hz.mdb',
'hz.mdb', true);
....
end;

procedure TMainForm.Timer1Timer(Sender: TObject);
begin
mainform.caption:=timetostr(now);
end;

This example do not update time in caption of mainform every 1000 ms but
only some time. It starts to update time on captino every 1000 ms after
uploading file.

I have DE5 and Indy 8.

Thanks for any advice.