Version 6.7.1 fixes a regression in the previous release that broke the delete specific format from book function.
Edit book: Preview panel: In dark mode when all of the background/foreground/link colors are set to "No change" do not render the book using dark colors.
Content server: When adding books, run all file type plugins before reading metadata.
E-book viewer: Fix copy to clipboard not ignoring text from elements that are marked as non user selectable.
E-book viewer: Fix a regression that broke adding of new lookup sources.
Book list: Allow changing column widths via a dedicated dialog by right clicking on column headers.
E-book viewer: Ask for confirmation when creating a highlight that will overwrite existing highlights.
Tag browser: Allow removing format from selected books by right clicking on the format in the Tag browser.
Template language: A new "Python template mode" which allows using arbitrary Python code in templates.