Kovid, in the changelog for 2.11 I have learned that:
Quote:
Fix a regression in 2.10 that causes Adding books from sub-folders, one book per folder to incorrectly add OPF files present in the sub-folders as an extra format.
Closes tickets: 1392864
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When I Drag & Drop an opf file in 2.11, it "incorrectly adds OPF file as an extra format", so I end up with two opf files in the Calibre book folder. One is metadata.opf, the other is the file I dragged & dropped in.
I am using Calibre under the Mint Linux Quiana (built on Ubuntu).