I've only tested in the Calibre viewer (OK) and the Kobo Libra (Broken) right now.
I repeated this in stages and each time removed and re-sent the epub to the Kobo Libra:
I did a conversion without fixing the spaces in the font file names. That worked OK on the Kobo and viewer.
Then I did the "try to fix errors" on
Quote:
Warning [6 / 7]
fonts/Georgia - Italic.ttf
The filename fonts/Georgia - Italic.ttf contains unsafe characters, that must be escaped, like this fonts/Georgia%20-%20Italic.ttf. This can cause problems with some e-book readers. To be absolutely safe, use only the English alphabet [a-z], the numbers [0-9], underscores and hyphens in your file names. While many other characters are allowed, they may cause problems with some software.
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This renamed the actual files and the references in the CSS to have underlines instead of spaces.
Except this time it works on the kobo libra as well as viewer!
I've seen this problem before occasionally and re-exporting the DOCX using SAVE AS (after going to properties and Include Fonts), then re-converting DOCX to epub2 has been OK.
So obviously it's intermittent. Perhaps in "Check" in the epub edit in Calibre I've asked to automatically fix, which renames the font files, but then somehow not saved the changed CSS file? That though would lose other fonts. But perhaps affect on bold and italic fallback is worse?