waveform preview is missing after Database Management

Hello!
I transfered Master Database from my laptop (Windows (C:)) to the external hard drive where all my track files are stored. I did it using Database Management feature in preferences. After that, when I open rekordbox on that same laptop all is fine except waveform previews - they are missing. Cue points, hot cues, grids and big waveform are loading when the track is playing, but waveform preview is missing. 

I tried to move Master database back to disk C, but there is always a mistake appears when I try to do it. 

What can I do in this situation? Reanalizing is not a solution because I have over 6000 tracks. 

Thank you in advance for any help!