I found a bug on the sync, when you turn on beat sync tracks are automatically brought to the same bpm but if disabled, when you load a new track this is always brought to the same bpm of the track being played, the only way to return to normal and quit the software and restart. i am using dvs.
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I also found that sync feature was totally unresponsive - although I'm yet to investigate further. I was at the start of a club set so quickly rolled Rekordbox back to the last software version in the 4.x series.