Official comment
6.0 has been updated to resolve this issue, but there is a different bug in 6.1.1; please try directly downloading 6.1.0 to see if this problem persists.
hi all
as many here are noticing, rekordbox 6.0 has a serious analysis bug.
it hangs while analyzing tracks ..the analyzing process get stuck on 0% randomly while cpu goes to maximum overheating my new full-specs MacBook Pro 2018
tried to close, reinstall ,reboot ,remove and re-add songs . it keeps doing it with different tracks, no problem on rekordbox 5.
analyzing a track beat sync will start when beat grid information is acquire
new tracks analyzing not working thank you

6.0 has been updated to resolve this issue, but there is a different bug in 6.1.1; please try directly downloading 6.1.0 to see if this problem persists.
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Bumping this. Mine isn't hanging, it's analyzing the key and bpm just fine but like you it will not set a preview or assign a beat grid.....
Same problem here. I've had it with Rekordbox 6. Just a succession of bugs and 'features' I don't need/want. So I've gone back to v5 as it's stable as I don't need what v6 has to offer.