Thanks for the reply TourGuide.
I THINK things are working once again.
I figured I would first try and look at the contacts stored on the MKC.
But, when I tried to do that, I got a message saying that "Automatic contact update was turned off" and then asking if I wanted to turn it on.
Of course I said yes.
Then I got a second message saying that my contacts were being downloaded from my phone to the MKC.
When THAT was all done, I was able to "see" all of my contacts that were now stored on the MKC.
Finally, I asked my wife to call me and "sure enough", her name (instead of her telephone number) appeared on the MKC screen.
So, I'm thinking (I know. There he goes again.), that maybe when the dealership upgraded the SYNC 3 awhile back, the contacts that were on the MKC at the time got deleted and the ability to automatically reload or update them from my phone to the MKC got turned off.
Gosh, that stuff scares me.
Anyway, things appear to be mended now.
Thanks for your reply and take care.