Have you tried to reanalyze a track and see if the preview comes back??
I lost my previous OS, but have a file copy of it. (Exporting libary is not an option anymore)
Now I installed a clean new Windows 10 and I am trying to get my libary back.
I was able to copy my database files from "... User / AppData / Roaming / Pioneer"
But when opening Rekordbox (4.5 in this case as this is what I used on my old system) the libary and playlists and browser etc are all ther, but no waveforms iin the preview window.
So I am wondering if there is another file storded somewhere, which includes the waveforms?
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Have you tried to reanalyze a track and see if the preview comes back??
If you've updated to a newer version of rekordbox, you should re-analyse as there were improvements to the analysis in later versions of rb5.
When reanalyzing the preview shows up again, but it changes the grid or bpm.
I did changes to a lot of songs, like double the bpm grid and / or adjusting the grid by hand.
All this would be gone by reanalyzing the songs.
That's why I was wondering, if it is possible to make them show up again with files stored somewhere. Even a bit of adjusting xml files would be fine for me, if this would do the trick.