>That would be an interesting question which I believe I would have a great deal of trouble trying to get an honest answer if they've specifically put something in NTWS 4.0 to prevent the app from running. However, the app runs fine in NT Server 4.0 so I doubt that's the problem.

It's true that NT 4.0 Server is more robust and contains more code. I guess they forgot something in the workstation version. Keep us inform when you'll find the problem. :)