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Old 04-29-2020, 12:38 AM   #1
berwyn
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Viewer always freezes after upgrade
Hi Folks. Has anyone had experience with this issue -- or shall I file a bug report?

I upgraded from calibre 4.8 to 4.14 and suddenly the ebook viewer freezes forever every time I try to view a book.

It happens on every book in my library including new books.

I've downgraded back to 4.8 and the problem is still there! I've tried both 32-bit and 64-bit version. The problem still exists.

What can I do?

Screenshot:

https://drive.google.com/file/d/1L-E...w?usp=drivesdk
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Old 04-29-2020, 12:43 AM   #2
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something on your computer is interfering with calibre, try running in safe mode.
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Old 04-29-2020, 11:01 AM   #3
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Quote:
Originally Posted by berwyn View Post
Hi Folks. Has anyone had experience with this issue -- or shall I file a bug report?

I upgraded from calibre 4.8 to 4.14 and suddenly the ebook viewer freezes forever every time I try to view a book.

It happens on every book in my library including new books.

I've downgraded back to 4.8 and the problem is still there! I've tried both 32-bit and 64-bit version. The problem still exists.

What can I do?

Screenshot:

https://drive.google.com/file/d/1L-E...w?usp=drivesdk
What OS are you using? There are known issues with QT5 which calibre uses and a fair number of Windows 7 video drivers and a smaller number of Windows 10 video drivers. If updating to the newest video driver doesn't help, you may have try a clean install of 4.8.
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Old 04-29-2020, 12:12 PM   #4
JimmXinu
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Possibly unrelated, I have had occasional freezes (perhaps 1 in 10) when starting the viewer since Calibre 4 came out. I've seen it starting viewer both inside Calibre and directly from double-clicking an ebook file or starting viewer by CLI.

Killing the viewer process and starting it again almost always works. I haven't been able to replicate the issue on demand.

I'm using Calibre 64 on Windows 10.
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Old 04-29-2020, 06:11 PM   #5
berwyn
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Originally Posted by kovidgoyal View Post
something on your computer is interfering with calibre, try running in safe mode.
Fixed. Interesting. A simple reboot (not even safe mode) fixed it. I should have thought of that.

A strange behaviour. I wonder what the underlying conflict was. Are there some logs somewhere that might clue me in?
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Old 04-29-2020, 10:10 PM   #6
kovidgoyal
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These dont happen in viewer code but in Qt WebEngine, if you wish to debug that, the relevant documentation is https://doc.qt.io/qt-5/qtwebengine-debugging.html
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