One collection has disappeared from albums list

[Marie-Noëlle Augendre]

Hi to everybody,

I had a bad surprise today when opening Digikam: one of my external drive
doesn't show in the albums list, though it still appears in the collections
list. And it is mounted and regularly accessible via the files manager.
Re-launch Digikam and even reboot the system make no change.

Screencopy here shows the albums list and the collections configuration
window:
https://www.dropbox.com/s/wtmzfd4mu5izgfk/20171112_S%C3%A9lection_001.png?dl=0
I'm running 5.6.0 version on a Fedora 26 system.

Any idea what could have gone wrong, and how to solve the issue?

Thanks for helping,
Marie-Noëlle

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