The Sync function no longer shows a progress screen, and does not revert back to the watch screen.
Well, it seems as if CS doesn't replay to the email address that the central support gave me, so I filled in (again) the online form and get a reply. No trying to debug - straight to RMA. Got the new watch back in 4 days.
The thing is, the watch automatically updated from 11.10 to 13.30, so I'm waiting to see if I'm back to square one.
Anyone know if it's possible to roll back an update?