First compact reduced file size 35.8%, second compact reduced it 0.02% and third compact reduced it 0.0%. unfortunately sync error reappeared. It would occur during the "Processing data from Ancestry" phase when the status bar was around 80%. I was going to wait a few more days to see if ACOM announced that there were issues. But when I noticed that the number of individuals had increased a few dozen (but far shy of 800 to be added) Inopted to delink my online tree with FTM. And not suprisingly, when I attempt to download AMT into FTM A sync failed message popped up.