Add me to the list of defunct syncers! I thought I had it all sussed but usually use the ipad rather than the macbook these days. I decided I needed to make some changes on the macbook and the tree which had been linked for ages was no longer linked so I downloaded and linked anew yesterday only to find that it was not linked today.
Not only that, when I downloaded and tried again today my two sons had been replaced by a couple of my 5 gt grandparents - weirdness!!!!
Glad to see I am not alone in struggling but it would be good if there was a bit of action as this seems to be an ongoing and widespread problem