Missing thumbnails, maybe digikam4.db involved

[ShutterBug]

Yes, I actually did try deleting thumbnails-digikam.db with a subsequent
re-scan, hoping that would solve the original problem of the missing
thumbnails.  That's why I tried the approach described above.  Since it did
work, where the other suggestions did not, I thought it useful to post here.

In your P.S., you ask if it's known why some thumbnails disappear...mine did
so when I was selecting (Ctrl-Click) a number of thumbnails for tagging. 
I'd selected a dozen or more and was clicking on the next one when,
suddenly, the selected thumbnails all vanished from the DigiKam thumbnails
view.  After checking to see if the images had been removed from the actual
file system directory, they were still there.  That's when I went down this
rabbit hole and - voila - what I found worked.  The lengthy re-scan time was
worth the wait in order to get DigiKam back on track.  And, yes, caution is
well-advised...

DigiKam's a really great program and kudos to those who developed it...



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Sent from: http://digikam.1695700.n4.nabble.com/digikam-users-f1735189.html