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Me too.
My only suggestion based on that is to backup the configuration directory, then exit calibre, delete the old configuration directory and restart calibre (it will create new configuration directory.
Then restart calibre, unhide your column, exit and restart calibre.
Probably won't work but easy enough to retore your configuration directory if it doesn't.
Another suggestion, really flailing now, is to create several columns and see if any of them stick. Maybe create an empty database(s) for this purpose one with copy structure ticked and one without so you can delete at will with no worries.
Helen
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