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Old 07-04-2020, 06:22 AM   #1
Inman
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Question Calibre ebook viewer not opening
I recently updated to Calibre 4.19 on my Windows 8 laptop, after using an old version for over a year. Now the problem is whenever I try to open the ebook viewer inside Calibre, it appears for a second and then closes automatically. Not just while opening books, even if I simply launch the ebook viewer directly from start menu, the same thing happens.

I tried running Calibre in debug mode but it seems to have entries about Calibre management app only, not the viewer. I updated to 4.20 as well just now but same issue. Any idea how to fix this?
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Old 07-04-2020, 12:49 PM   #2
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It will be an incompatibility with your graphics card/drivers. try updating your drivers and if that does not work, turn off hardware rendering as described here: https://doc.qt.io/qt-5/qtwebengine-debugging.html
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Old 07-05-2020, 05:52 AM   #3
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Quote:
Originally Posted by kovidgoyal View Post
It will be an incompatibility with your graphics card/drivers. try updating your drivers and if that does not work, turn off hardware rendering as described here: https://doc.qt.io/qt-5/qtwebengine-debugging.html
Thanks. That worked.
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Old 06-14-2022, 01:27 PM   #4
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Calibre ebook viewer not opening
Quote:
Originally Posted by Inman View Post
I recently updated to Calibre 4.19 on my Windows 8 laptop, after using an old version for over a year. Now the problem is whenever I try to open the ebook viewer inside Calibre, it appears for a second and then closes automatically. Not just while opening books, even if I simply launch the ebook viewer directly from start menu, the same thing happens.

I tried running Calibre in debug mode but it seems to have entries about Calibre management app only, not the viewer. I updated to 4.20 as well just now but same issue. Any idea how to fix this?
Quote:
Originally Posted by kovidgoyal View Post
It will be an incompatibility with your graphics card/drivers. try updating your drivers and if that does not work, turn off hardware rendering as described here: https://doc.qt.io/qt-5/qtwebengine-debugging.html
In Calibre 5.43 when I use the view button, the icon appears on my Windows 11 toolbar but no window opens. When I hover over the icon that appeared on my toolbar it shows an empty mini-window above it with the name of the ebook I was attempting to open. When I click on this empty mini-window it dissapears but nothing appears in the screen. When I go to that very same ebook file with file explorer and right-click it and choose open with the calibre viewer it opens normally.

Any ideas to fix this problem?
Last edited by alansplace; 06-14-2022 at 01:39 PM. Reason: add a little
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Old 06-14-2022, 11:55 PM   #5
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It will be off screen use th ewindows key to gather all offscreen windows, I forget what it is, a bit of googling will get it for you
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Old 06-15-2022, 12:36 AM   #6
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I stumbled on this the other day ==>> How to Find & Recover an Off-Screen Window in Windows 10

BR
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Old 06-15-2022, 01:08 AM   #7
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Quote:
Originally Posted by kovidgoyal View Post
It will be off screen use th ewindows key to gather all offscreen windows, I forget what it is, a bit of googling will get it for you
Thank you Kovid!

It's now quite usable, but there are still issues. First, every time I want to open another book using Calibre's button I must move the resulting new viewer window from off-screen to on-screen again. There is also another issue which I'll save for later. Here's hoping you don't mind them one at a time.

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Old 06-15-2022, 01:12 AM   #8
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Quote:
Originally Posted by BetterRed View Post
I stumbled on this the other day ==>> How to Find & Recover an Off-Screen Window in Windows 10

BR
Thanks, good find, helped me with specific info.
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Old 06-15-2022, 04:08 AM   #9
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calibre doesnt control window placement, that's up to the operating system.
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Old 06-15-2022, 11:44 AM   #10
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Quote:
Originally Posted by alansplace View Post
Thank you Kovid!

It's now quite usable, but there are still issues. First, every time I want to open another book using Calibre's button I must move the resulting new viewer window from off-screen to on-screen again. There is also another issue which I'll save for later. Here's hoping you don't mind them one at a time.

Are you exiting the previous window first. Windows remembers where it was when it exits.
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Old 06-15-2022, 11:51 AM   #11
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Quote:
Originally Posted by kovidgoyal View Post
calibre doesnt control window placement, that's up to the operating system.
Thanks Kovid. I didn't know that. I'll not need to ask anything else as it's totally usable now.

again!
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Old 06-15-2022, 11:55 AM   #12
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Quote:
Originally Posted by theducks View Post
Are you exiting the previous window first. Windows remembers where it was when it exits.
As I use it I'll experiment with this idea, thanks!

Just did this:

1. opened Calibre
2. selected a book
3. clicked on the view button
4. moved the window from off-screen to on-screen
5. closed the viewer
6. selected another book
7. the new window needed to be moved to on-screen just like the first one
Last edited by alansplace; 06-15-2022 at 12:24 PM.
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Old 06-15-2022, 02:59 PM   #13
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What file is it that keeps the viewer's window size and position information?
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Old 06-15-2022, 08:33 PM   #14
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Jon - Read what THE MAN wrote.

Quote:
Originally Posted by kovidgoyal View Post
calibre doesn't control window placement, that's up to the operating system.
Quote:
Originally Posted by alansplace View Post
As I use it I'll experiment with this idea, thanks!

Just did this:

1. opened Calibre
2. selected a book
3. clicked on the view button
4. moved the window from off-screen to on-screen
5. closed the viewer
6. selected another book
7. the new window needed to be moved to on-screen just like the first one
After step 4 try moving and/or resizing the viewer window before closing it.

Are you utilising any of the new window management features in Windows 11 (e.g. Snap Layouts), or a 3rd party windows manager (e.g. AquaSnap, Actual Windows, Divvy etc)?

BR
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Old 06-15-2022, 08:43 PM   #15
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Quote:
Originally Posted by JSWolf View Post
What file is it that keeps the viewer's window size and position information?
What BR and Kovid said (I think I also hinted) The Registry in Winblows
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