Without any detail no one would be able to help you. You didn't even mention if you're on windows or mac!
error messages and a description of what you did and your settings in RB may also help
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Rekordbox 4.1.1 Cant't load song , lost hot cue,
Since the 4.1.1 update i lost everything how can i get my things back?
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and see this: https://forums.pioneerdj.com/hc/es/community/posts/206610706-REKORDBOX-DJ-4-1-UPDATE-ERASED-CUES-COLOR-AND-SONGS-INFO
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