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I was catching up on new discussion threads over on MobileRead this morning when I found multiple complaints in the calibre forum about the new app. Nevertheless, in spite of the improvements, users are not happy with the changes to the interface. (Note: that applies to the metadata, not the contents of a book, so it’s really not a big deal.) This makes it faster and less resource intensive, however it supports less HTML and CSS, which means if you used advanced styling in your comments it may not fully work". The new viewer is reportedly faster, but that comes with a trade off the footnotes for the changelog mention that the new viewer might break any fancy formatting notes or comments in your metadata: "The Book details panel now no longer uses a full browser engine for rendering.
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