Digikam Missing thumbnails

[Jean]

I was using Digikam 5.7 on KDE Neon (ppa-backport).

It worked fine until yesterday (2017-12-05). This morning I did an
upgrade proposed by the OS, but I do not know if it is related. Now I
have the same problem mentioned before by Shutterbug (2017-12-01 21:43
UTC) : No thumbnails are displayed in Digikam when you are in the
''Albums'' section. But you can see the 'thumbnails and preview, when
you select the Labels and Timeline sections. Deleting the databases or
starting with a new photos directory did not help.

So I restored my previous digikam databases and started using the
app-image (5.7) and everything is fine again.