Calibre 8.10 Book Viewer not displaying text

institute · Yesterday, 09:07 AM

Hi all,

The Calibre 8.10 Book Viewer is not displaying text properly. This is an issue with every book in the Library (all epubs). Instead I just see a wall of question marks each within a square. I have attached a screenshot. These books will display correctly in the Books.app using "Open with." I am on MacOS Sequoia 15.7 using a M2 Mac Mini. The Calibre library is stored on an external hard drive. Other files on that hard drive open properly in their respective applications. I have restarted the computer and reinstalled Calibre to no avail. Any ideas what the issue might be?

Thanks

theducks · Yesterday, 10:06 AM

I suspect the viewer has had a Font set to something that does not support your books character set.

With the viewer CLOSED (off)
In the configuration folder:
Rename viewer-webengine.json to viewer-webengine.json.bak

When you next start the viewer, it will be recreated (with default settings).

If this works, make your other setting changes as desired and delete the previous BAK file.

If it does not help and you had customizations you wanted to keep, delete the NEW version, then rename the .BAK (by removing the .BAK part) file to the original

kovidgoyal · Yesterday, 10:28 AM

It's likely a bad font in the system, see for example: https://bugs.launchpad.net/bugs/2125179

institute · Yesterday, 10:47 AM

Yes. That was it. I had been using Garamond for ages but apparently that font file is suddenly corrupt according to Font Book. I changed the font in the viewer preferences and it works again. Thanks!

Yesterday, 09:07 AM	#1
institute Enthusiast Posts: 29 Karma: 68 Join Date: Apr 2013 Device: Kobo Libra 2, iPad	Calibre 8.10 Book Viewer not displaying text Hi all, The Calibre 8.10 Book Viewer is not displaying text properly. This is an issue with every book in the Library (all epubs). Instead I just see a wall of question marks each within a square. I have attached a screenshot. These books will display correctly in the Books.app using "Open with." I am on MacOS Sequoia 15.7 using a M2 Mac Mini. The Calibre library is stored on an external hard drive. Other files on that hard drive open properly in their respective applications. I have restarted the computer and reinstalled Calibre to no avail. Any ideas what the issue might be? Thanks Attached Thumbnails Last edited by institute; Yesterday at 09:18 AM.

Similar Threads
Thread	Thread Starter	Forum	Replies	Last Post
Issue with displaying images in an ebook in Calibre Viewer	MIRS90	Viewer	4	11-11-2022 06:36 PM
Calibre Japanese Vertical Text Viewer Problem	fobos3	Calibre	10	06-12-2020 12:32 PM
E-book viewer displaying greyed out	nindotza	Library Management	5	03-24-2020 07:09 AM
How to darken text in e-book viewer without brightening background?	woodr2011	Library Management	5	12-28-2019 01:40 PM
E-book viewer: Viewing images and text	BrainDeadZero	Calibre	1	03-07-2018 10:06 PM

Yesterday, 10:06 AM	#2
theducks Well trained by Cats Posts: 31,171 Karma: 60406498 Join Date: Aug 2009 Location: The Central Coast of California Device: Kobo Libra2,Kobo Aura2v1, K4NT(Fixed: New Bat.), Galaxy Tab A	I suspect the viewer has had a Font set to something that does not support your books character set. With the viewer CLOSED (off) In the configuration folder: Rename viewer-webengine.json to viewer-webengine.json.bak When you next start the viewer, it will be recreated (with default settings). If this works, make your other setting changes as desired and delete the previous BAK file. If it does not help and you had customizations you wanted to keep, delete the NEW version, then rename the .BAK (by removing the .BAK part) file to the original

Yesterday, 10:28 AM	#3
kovidgoyal creator of calibre Posts: 45,518 Karma: 28548962 Join Date: Oct 2006 Location: Mumbai, India Device: Various	It's likely a bad font in the system, see for example: https://bugs.launchpad.net/bugs/2125179

Yesterday, 10:47 AM	#4
institute Enthusiast Posts: 29 Karma: 68 Join Date: Apr 2013 Device: Kobo Libra 2, iPad	Yes. That was it. I had been using Garamond for ages but apparently that font file is suddenly corrupt according to Font Book. I changed the font in the viewer preferences and it works again. Thanks!