[Terisa de morgan]

Copied from @BetterRed's post, updating it with my test data:

I created an fresh library called 'ΩTest'

Using the Add Empty book option, I added a book with Author 'Terisa' and Title "Prueba 1', I checked the create EPUB option.

Then I F2'd the Author cell and pasted the 'Ω' at the front of the Author cell and pressed Enter, the error "Failed to set data: blah-blah" popped, but when I dismissed it I had 'ΩTerisa' in the Author cell. (The stack trace happens at this point).

I opened the Book folder and checked that they were hardlinks. Then I checked I had 'Terisa' and 'OTerisa" Author folders (the 'O' being the Latinised Ω), and there was a 'Prueba 1 (1)' folder in both Author folders and in the two book folders there was a hardlink to the epub file, viz:

ΩTest
    Terisa
        Prueba 1 (1)
            Prueba 1 - Terisa.epub (hardlink)
    OTerisa
        Prueba 1 (1)
            Prueba 1 - OTerisa.epub (hardlink)

This happens at the three situations (with plugins, starting calibre with --ignore plugins and removing files from the plugins folder).