Mync might fail to open library data. You may be able to fix the problem by using backup data(Mync automatically back up the library).

Try the following:

1. Enter %AppData% into address bar of Windows Explorer.

2. Open Grass ValleyMyncBackup folder.

3. You will see back up file that has Mync_backup_[YYYYMMDDHHMMSS].lrdbk file name. Date and time is back up launched time.

4. Change file extension of target back up file from lrdbk to zip.

5. Create a new folder then copy the .zip file into the folder.

6. Unpack the .zip then overwrite Contents.db file into C:\UsersC:\[USERNAME]C:\AppDataC:\RoamingC:\Grass ValleyC:\Mync from unpacked to. If Contents.db-shm, Contents.db-wal exist, delete both files.