I see a few people have this problem, but I still haven't found a solution.
I can sync my workouts with Training Center, but Garmin Connect won't launch to sync. When I launch Garmin Connect manually I get an error message. I uninstalled Garmin Connect and reinstalled it, and it worked, only to fail on the next workout. I did the same uninstall and reinstall and it worked, only to fail on the next workout. Now, even the uninstall and install doesn't work.
I have a Forerunner 305 if that helps
What is up with this? Such a frustrating issue to deal with. Seriously thinking of going with another route at this stage.