Windows Live Mail Contacts

I am using Windows 8.1 and Windows Live Mail.  I used to be able to see my contacts list when I pressed the contacts icon at the lower left of the screen.  Suddenly I cannot.  The contacts still exist, because I can start a new email and type in a contact and whichever one I type can be entered on the "To" line.  If I then double click it, the contact info screen appears and I can see all the info.  If I use the People icon on the start screen, I see a contact list, but it does not show recent changes.  Did I do something inadvertently to cause this?  How can I make the feature work again?