Hi Jim,
Over the past week, I've had 2 long sessions with Adobe support--trying to figure out why I can't get the checkboxes to appear in LR4 when I pull down the address menu. Finally today, I was on my 3rd follow up call when the technical support guy came back on line and said the address book feature in LR is not supported on the new iMac. I was skeptical. He said he would send me the link but he hasn't done that yet. Maybe an updgrade to LR is coming. thanks again