Disconnect all account download connections and then sync - no change.Prefs > Connected > Cloud > reset - no change forcibly breaks all account credentials.Prefs > Connected > Cloud > delete - no change forcibly breaks all account credentials.I even rolled back to a month-old backup - no change.It started a few days after upgrading to 6.3.3 so I rolled back to 6.2.2 - no change.Prefs > Sync > Off - does prevent the error but also defeats the purpose a bit The second error window actually causes Quicken to beachball and both error windows force focus in front of ALL other windows.
The first one happens as the update is ending, and the second happens a few minutes after the sync arrow has stopped. For the last few days, I have not been able to update accounts without getting two generic 'Sync Error' popups ('Quicken encountered an error while communicating with out servers') for every update.