I had a similar Issue. I believe I was changing the display in the Application screen and my PRIMARY SHORTCUTS (Home, Application, Contacts, & Messaging) were changed. The only one that is displaying when I am on the Home Screen is the APPLICATIONS primary shortcut , and the only one that displays on the Application Screen is the HOME primary shortcut. I would prefer to not do a system restore is possible. If I try to drag and drop in the primary shortcut area the shortcut won't stay there.