I'm still using Calibre 4.23 because I've got another PC with Calibre 2.0 that I cant upgrade (its on XP and the hardware isn't suitable for any newer Windows OS) that I need to sync the Calibre library with. When Calibre 5.0 came out, I read
https://calibre-ebook.com/new-in/fourteen :
Quote:
Backwards incompatibilities
There are a few minor backwards incompatibilities to be aware of in calibre 5
...
* Because of the support for library wide annotations, the database format was slightly changed. While calibre 4.23 is able to open and operate with calibre 5 databases, older versions of calibre may have trouble.
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Until I bite the bullet and put another solution together for reading my ebooks on a big screen in that room, so I can retire Calibre 2.0 and scrap the XP PC, I'm not likely to upgrade from 4.23.
However, many thanks for the suggested [base_xenforoforum] tagstyle rollback via personal.ini. I'll probably give it a shot next time I need to update a SufficientVeocity or SpaceBattles fic.