MessageDlg Not Performing Correctly

I have an application with numerous forms.  On some forms when I use the messagedlg function, message box does not appear but the system is still waiting for a response so the application is frozen because I can not give it a response.  Does anyone know why this may be happening and why on some forms in the application but not others?
mcmahlingAsked:
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delphizedCommented:
messagedlg actually create a runtime delphi tform and populate with components, and then make a showmodal.
there is no particular reason to froze the application. (but do you use some secondary threads?)
Normally I use windows.messagebox that is a call to a window API function and is more stable.
you can try with it:

  MessageBox(self.handle,
             'Hello',
             PChar(Application.title),
             MB_OK or
             MB_ICONINFORMATION or
             MB_APPLMODAL);

you can also use application.messagebox, in which there is a call to windows.messagebox, but it's surrounded with delphi code. It's you choice.

in both cases I think it's better that messagedlg.
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songhdCommented:
I think some wrong with your application,some fatal wrong  code after the showmessage.Today I happened to meet it.I use AdoQuery to find the record,before this I use showmessage,but the messagebox did not exist ,the system is still waiting for a response so the application is frozen.
Now code is :
procedure TForm1.Button1Click(Sender: TObject);
begin
ShowMessage('hi');
while not AdoQuery2.Eof do
begin
if Edit1.Text=AdoQuery2.FieldByName('name').AsString then Have:=True;
//Now, I find out that I lost the AdoQuery2.Next code.
end;
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