Loading a track with no Beatgrid will disable Sync for that deck.
A Beatgrid will be created for un-analyzed tracks if ‘Set Auto BPM’ and ‘Set Beatgrid’ are enabled in the Offline Player.
Once a Beatgrid has been created you can then press Sync to engage Beat Sync.
If ‘Set Beatgrid’ is not enabled in the Offline Player, then only a BPM value will be created and Sync will not be available for that track.
If a track has previously been analyzed, but has no Beatgrid, then Serato DJ will not create a new Beatgrid for that track.
TIP: Manually add a Beatgrid for tracks to enable Sync functionality for that deck.