I have compacted my file (5,000 plus persons) and I get an error message - The last sync failed. An error occured while "Preparing data to be downloaded from Ancestry" Please try again later. I have also had the error message - An error occurred while syncronizing this tree. You can try again later, but if this message recurs, you may need to unlink your trees and upload a new linked tree from Family Tree Maker. I did upload a new tree once and it worked for a day or two and then the error came back. FTM also goes to sleep and it says "not responding" in the title bar of the FTM window.