Why have all my contact cards disappeared?
Downloaded Yosemite on my late 2012 iMac, now all my cards in Contacts have disappeared, as have all entries in my Calendar. I don't use the cloud, wonder if this is connected to the problem. Thanks in advance for any help.
iMac (27-inch, Late 2012), OS X Yosemite (10.10.4), 250 GB SSD