Calibre viewer opens epub with blank page

Truus · 09-28-2026, 08:48 AM

Calibre viewer opens epub with blank page. On Windows 10.
Calibre recommendations for White page: no result (GUP driver update & slow boot).
Uninstalled Calibre - installed frech, several versions (9.something): doesn't change a thing. Calibre remembers settings and books across-installings (with Revo-uninstaller, thoroughly).
Uninstalled ADEditions: no change.

Same Calibre version on another W10-divice works fine, with or without ADE installed, with or without DeDRM installed. All of which I tried out on the obstinate one as well.

Running out of ideas,
Truus

kovidgoyal · 09-28-2026, 09:26 AM

reboot in safe mode and see if it works

Truus · Yesterday, 07:25 AM

Thanks, I will.
In preparation first thoroughly uninstalled Calibre; shut down computer.
Started in safe-mode.
Then installed fresh Calibre (9.15.0 but same issue with older versions): same problem, same 2 books still installed, that open with empty page; freshly added book: same empty page without turning wheel (did give it ample time).

Do you have more ideas?
(and: don't understand procedure for adding screenshot...)

JSWolf · Yesterday, 07:29 AM

Load the eBooks in the editor and using the epubveri plugin, valitdate the eBooks. Mabe there's an error.

Truus · Yesterday, 08:29 AM

Thanks - tomorrow hopefully, i'm exhausted for today

Truus · Yesterday, 01:27 PM

Realised I have no clue what this entails:
Turn off hardware acceleration in Qt WebEngine
(https://manual.calibre-ebook.com/faq...-e-book-viewer)

Truus · Yesterday, 02:27 PM

Found Qt WebEngine:
clicked the button to standard - is this the right configuration?

Click image for larger version

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kovidgoyal · Yesterday, 09:17 PM

It is off by default in calibre 9

Truus · Today, 06:13 AM

Do you have other ideas about the cause of my problem?

JSWolf · Today, 06:46 AM

What happened when you tried safe mode? Have you tried eBooks that you know previously worked? Have you tried a repair install?

Truus · Today, 11:58 AM

Before new installation of W10 on this PC everything was fine.
Safe mode changed nothing. Repair: no change. Un-install and freshly install: nothing. Un-installed ADEditions: no change.

Tried all sorts of books:
- bought and ADE authorized books from some time ago
- Gutenberg books (free downloads)
- DeDRM-ed (Calibre) books that were transportable to non-ADE Authorized Laptop
- freshly bought and ADE authorized book
Empy frame with all of them.

Truus · Today, 12:11 PM

Safe mode changed nothing. Repair: nothing. Un-installing and fresh install: nothing. Deleting ADEditions: nothing.

Books that used to work perfectly before installing W10 afresh:
- freshly bought books with ADE authorisation
- DeDRM-ed (Calibre) bought books that used to transport between USB-sticks and to unauthorised laptop
- free (Gutenberg) books
- freshly downloaded free books
Now all open with a white page.

Truus · Today, 12:13 PM

Wrote a reply 3 times, but none of them publish...

Comfy.n · Today, 12:22 PM

Hi Truus,

I suggest you try either upgrading or downgrading your graphics driver.

edit: I meant updating or maybe reverting

Truus · Today, 12:26 PM

Do you mean updating the driver?
I checked: lates update is installed.

09-28-2026, 08:48 AM	#1
Truus Junior Member Posts: 10 Karma: 10 Join Date: Sep 2026 Device: BeBook	Calibre viewer opens epub with blank page Calibre viewer opens epub with blank page. On Windows 10. Calibre recommendations for White page: no result (GUP driver update & slow boot). Uninstalled Calibre - installed frech, several versions (9.something): doesn't change a thing. Calibre remembers settings and books across-installings (with Revo-uninstaller, thoroughly). Uninstalled ADEditions: no change. Same Calibre version on another W10-divice works fine, with or without ADE installed, with or without DeDRM installed. All of which I tried out on the obstinate one as well. Running out of ideas, Truus

Yesterday, 07:25 AM	#3
Truus Junior Member Posts: 10 Karma: 10 Join Date: Sep 2026 Device: BeBook	Thanks, I will. In preparation first thoroughly uninstalled Calibre; shut down computer. Started in safe-mode. Then installed fresh Calibre (9.15.0 but same issue with older versions): same problem, same 2 books still installed, that open with empty page; freshly added book: same empty page without turning wheel (did give it ample time). Do you have more ideas? (and: don't understand procedure for adding screenshot...) Last edited by Truus; Yesterday at 07:28 AM. Reason: misspelling

Today, 12:22 PM	#14
Comfy.n want to learn what I want Posts: 2,445 Karma: 9656783 Join Date: Sep 2020 Device: Libra Colour	Hi Truus, I suggest you try either upgrading or downgrading your graphics driver. edit: I meant updating or maybe reverting Last edited by Comfy.n; Today at 01:42 PM.

Today, 12:26 PM	#15
Truus Junior Member Posts: 10 Karma: 10 Join Date: Sep 2026 Device: BeBook	Do you mean updating the driver? I checked: lates update is installed. Last edited by Truus; Today at 12:30 PM.

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09-28-2026, 09:26 AM	#2
kovidgoyal creator of calibre Posts: 46,517 Karma: 29634066 Join Date: Oct 2006 Location: Mumbai, India Device: Various	reboot in safe mode and see if it works

Yesterday, 07:29 AM	#4
JSWolf Resident Curmudgeon Posts: 85,114 Karma: 153791427 Join Date: Nov 2006 Location: Roslindale, Massachusetts Device: Kobo Libra 2, Kobo Aura H2O, PRS-650, PRS-T1, nook STR, PW3	Load the eBooks in the editor and using the epubveri plugin, valitdate the eBooks. Mabe there's an error.

Yesterday, 08:29 AM	#5
Truus Junior Member Posts: 10 Karma: 10 Join Date: Sep 2026 Device: BeBook	Thanks - tomorrow hopefully, i'm exhausted for today

Yesterday, 01:27 PM	#6
Truus Junior Member Posts: 10 Karma: 10 Join Date: Sep 2026 Device: BeBook	Realised I have no clue what this entails: Turn off hardware acceleration in Qt WebEngine (https://manual.calibre-ebook.com/faq...-e-book-viewer)

Yesterday, 02:27 PM	#7
Truus Junior Member Posts: 10 Karma: 10 Join Date: Sep 2026 Device: BeBook	Found Qt WebEngine: clicked the button to standard - is this the right configuration?

Yesterday, 09:17 PM	#8
kovidgoyal creator of calibre Posts: 46,517 Karma: 29634066 Join Date: Oct 2006 Location: Mumbai, India Device: Various	It is off by default in calibre 9

Today, 06:13 AM	#9
Truus Junior Member Posts: 10 Karma: 10 Join Date: Sep 2026 Device: BeBook	Do you have other ideas about the cause of my problem?

Today, 06:46 AM	#10
JSWolf Resident Curmudgeon Posts: 85,114 Karma: 153791427 Join Date: Nov 2006 Location: Roslindale, Massachusetts Device: Kobo Libra 2, Kobo Aura H2O, PRS-650, PRS-T1, nook STR, PW3	What happened when you tried safe mode? Have you tried eBooks that you know previously worked? Have you tried a repair install?

Today, 11:58 AM	#11
Truus Junior Member Posts: 10 Karma: 10 Join Date: Sep 2026 Device: BeBook	Before new installation of W10 on this PC everything was fine. Safe mode changed nothing. Repair: no change. Un-install and freshly install: nothing. Un-installed ADEditions: no change. Tried all sorts of books: - bought and ADE authorized books from some time ago - Gutenberg books (free downloads) - DeDRM-ed (Calibre) books that were transportable to non-ADE Authorized Laptop - freshly bought and ADE authorized book Empy frame with all of them.

Today, 12:11 PM	#12
Truus Junior Member Posts: 10 Karma: 10 Join Date: Sep 2026 Device: BeBook	Safe mode changed nothing. Repair: nothing. Un-installing and fresh install: nothing. Deleting ADEditions: nothing. Books that used to work perfectly before installing W10 afresh: - freshly bought books with ADE authorisation - DeDRM-ed (Calibre) bought books that used to transport between USB-sticks and to unauthorised laptop - free (Gutenberg) books - freshly downloaded free books Now all open with a white page.

Today, 12:13 PM	#13
Truus Junior Member Posts: 10 Karma: 10 Join Date: Sep 2026 Device: BeBook	Wrote a reply 3 times, but none of them publish...