The machines that the app is running on are pretty decent machines. I think they are at least 1 GHZ processors and they have 256 MG a RAM. One thing that has happened repeatedly, is that, if the user hits the enter key while in a check box, the app stops responding for at least 10 seconds AND there is no code in the checkbox at all. I don't know what the problem is, but I seem to be having significant performance issues with VB.NET.