Application Main window not appearing on application launch

FROM : Clayton Leitch
DATE : Sat Jun 21 21:18:46 2008

Core data document application:  I edited the MyDocument.nib file to 
add a few fields to one view and now when I start the application, the 
main window does not appear.  Also, the new menu fails to produce a 
window.  What caused this and how do I avoid it.