Suddenly getting a message: "There was an error syncing with Garmin Connect" after updating to 4.1.10.0 for the Mac. Install procedure went fine as usual.
I am sorry about the trouble syncing your device. There was an issue overnight that was preventing some people from syncing that was resolved this morning. If you are still having trouble, please try the steps in this FAQ:
What should I do if I am unable to sync my mass storage fitness device using Garmin Express?