Can't edit or delete mac contacts
Mac contacts has gone kaflooey for me. I can't delete a card (the option is grayed out). I can't edit a card either. The edit button works as usual (it lets me type in the contact card) but when I click "Done" my changes disappear. Things disappear: I make a new card, and enter data, and only part of the data stays on the card. Then a few minutes later, I revisit the card and all the data except the name is gone.
I suspect this has some connection with iCloud, but I can't figure it out.
Help?
MacBook Pro, OS X Mountain Lion (10.8.3)