Dan,
Is there any code after Show() that closes the form, like myFrm.Close() or myFrm.Dispose()?
Can you add a breakpoint in the form's constructor and step through?
What happends if you add a MessageBox.Show() imediately after myFrm.Show()?

Hmm I must agree with Kevin, it would help if you posted the relevant code.

Einar
>Show()
>
>I get all kinds of errors when I use ShowDialog().