My address book is frozen
My address book is frozen since El Capitan was installed. Is there a download to fix this?
iMac (24-inch Mid 2007), OS X El Capitan (10.11.6)
have you rebooted? does it happen every time? have you forced quit but not rebooted?
reboot into safe mode
https://support.apple.com/en-us/HT201262
then open the address book.