Too often, there are 'knee jerk' reactions to problems with software.
Solutions such as
-clear the cache
-check your antivirus
and the best of all
- reinstall the software
It is wise to keep in mind that items such as fitday, itunes, cloud items like dropbox, etc. are all two way streets. Until and unless the 'cloud' or server admin team says 'all ok at our end', it is wise to leave your end alone. Especially when others are voicing the same problem.
Sit back and take it easy. All will be synced in time.