>I added a new setting in my application Property dialog (that is saved to the Windows Registry) so that the user can change this number from -1 up to 5 seconds and see which one works best in their situation. I notice that it does act differently on different machines... perhaps this will help if I allow it to be tweaked by the user.

Great idea, Mel.
Tell me if you get any feed back from your users.

Cheers.