So like many others yesterday all my activities 'disappeared'. Today I upgraded to 7.13.1.0 and today's activity is still there.
I undeleted the activities using a disk recovery tool. They are all visible (via Windows File Explorer) but now when I sync with GE I get an error "There was an error syncing with Garmin Connect". Have I screwed up some indexing somewhere when manually copying them back? Anything I can do to resolve?