OK, it was the locale after all. Thanks to @BetterRed the exact culprit has just been identified.
If I change the Windows settings for numbers (as above), sorting works fine.
Now the question is:
what to do so that I can keep my Windows settings and sorting still works in Calibre?
Strangely enough, this affects exclusively sorting the composite columns: floating numbers custom columns work fine regardless of the settings in Windows.
// EDIT
Got the final solution for the sorting problem! Still kinda puzzled.
I changed the settings for numbers back. Despite that, sorting still works in Calibre.
Last edited by Joanna; 06-05-2016 at 07:03 PM.
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