Thread: Kobo Bug thread
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Old 11-08-2020, 01:22 PM   #1308
DNSB
Bibliophagist
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Posts: 47,402
Karma: 171313058
Join Date: Jul 2010
Location: Vancouver
Device: Kobo Sage, Libra Colour, Lenovo M8 FHD, Paperwhite 4, Tolino epos
Quote:
Originally Posted by Aromatisse View Post
Product: Touch
Firmware: 4.24.15676
Plugins: none
File types: epub
Sideloaded or from Kobobooks: sideloaded
On external SD: yes
Steps to reproduce: since the last firmware update, often when I open a book it will display a blank page instead, and say that I am on page 1 of 1. Attempting to go to the next page will close the book and mark it as completed. If I re-open the book and it does load (whatever it does or not seems random) it will go back to the page it should have in the first place, and progress will go back to displaying normally.
Workaround: none that I can find, other than reopening books until things work normally.
Try checking the structure of the ebook. The only consistent trigger for that issue that I've found is epubs where the entire text is in one overly large file. If you are using calibre and have the Quality Check plugin installed, use it's Check epub structure => Check oversize html files. You can also try opening the book with calibre's editor or a Sigil user can try opening it in Sigil. If you use neither, try opening the book with a zip file utility (I like 7Zip). If you see a single or two html files and one of them is over 500K, it's a likely troublemaker. See attached image for an example (sadly this epub is a fine example of a total mess since all the files other than the container.xml are stored in the root.

A quick and dirty fix is to do a calibre epub to epub conversion.
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