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Originally Posted by bk1
What is going on, and how do I get back to my old 4.8 version with the DRM function working?
I should mention that after downgrading, I can re-import the book again. Calibre keeps both the old and the new book. And the one imported with 4.8 can be converted like before. So, really my question is - how do I remove the first non-convertible book?
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From The "New in Calibre 5.0" page under the heading "Backwards incompatibilities"
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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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So you need to use Calibre 4.23